This page is to consider the concept of the executive cabinet, with a case study focus on the US Cabinet; the senior most executive officers of the federal government. The model of executive cabinet is also found in business/corporations, and foreign governments. The title "secretary" is unique to American government, and is equivalent to "minister" as in European government, and the People's Republic of China.
I have scoped out and partially vetted a bench of conservative Supreme Court candidates. It is probably inevitable anyway that we our headed for a constitutional crisis circa 2017 or later. 
This is perhaps the fantasy football of good government. The Supreme Court has 4 of 8 Marxist judges. If the contested 1 vote flips from conservative to "moderate liberal" big government authoritarian Merrick Garland then the Marxists will launch all out war against gun freedom (2A) and the ensemble of rights of 1A.
The speculative parlor game becomes no fun at all if forced to rejigger for a generic Democrat cabinet or Vichy Republican cabinet.
They are not executive positions but the next president will also appoint Associate Justices and federal judges. There is much more to say on why liberal lawless philosophy is full of deceit and skulduggery. Of course there are degrees of leftism and liberal elitism, this wiki presumes that many liberals (common folks, small folks such as myself an ex-Democrat) are simply deceived and some will soften their hearts toward the truth if faced with organized, quality case material.
For the game theorist and for Trump's actual selection, the outsider/insurgent candidate has a more difficult task in discerning who he can trust. An early endorsement for Trump is a good place to start, some folks on this speculation roll have and some have not. Neocon crew such as Romney, Cruz, Rubio, Kasich, Hayley, it is nothing personal against these people and I greatly respect their success. I am saying they are non-considerations largely for the reason that GOPe cannot be trusted.
Secretary of State
Treasury: Jim DeMint (former US Senator from South Carolina, and CEO of Heritage Foundation) would be an excellent person for this post. I am also certain that Trump can find powerful alternatives, businessman and outsiders whom he knows.
Defense: perhaps Jeff Sessions (US Senator from Alabama), although he may be more valuable, even essential, as a Senate ally and lawful warrior.
Attorney General: Michael Cohen or Chris Christie is likely to fill this position. Cohen is an attorney and EVP for Trump Organization, and Christie is Governor of New Jersey.
Interior: Jan Brewer (former Governor of Arizona) has good credentials for this post, Interior ought to be retooled for border security and love of countrymen. This department is one that has terrible amounts of federal waste, fraud, and abuse.
Agriculture: Mike Huckabee (former Governor of Arkansas) would be a good choice. In the past I have noticed that Agriculture is conspicuously high ranked in the line of succession.
Trump has indicated that Rudy Giuliani (former Mayor of New York City) is a top seed for Homeland Security. I contend that the department should be name changed to Civil Defense.
Critical non-cabinet posts include Chief of Staff, Senior Advisor, and UN Ambassador.
These people form a fairly excellent short list of top contenders for the big court where American liberty will endure or die within a few years.
Viet D. Dinh; Paul Clement; Diane S. Sykes; Bill Pryor; Kelly Ayotte; Susana Martinez; Raoul G. Cantero III; Janice Rogers Brown; and Spencer Abraham (9 candidates)
Genesis 9:6 Whoso sheddeth man's blood, by man shall his blood be shed: for in the image of God made he man.
Ezra 7:25 And thou, Ezra, after the wisdom of thy God, that is in thine hand, set magistrates and judges, which may judge all the people that are beyond the river, all such as know the laws of thy God; and teach ye them that know them not.
Psalm 2:10 Be wise now therefore, O ye kings: be instructed, ye judges of the earth. 11 Serve the Lord with fear, and rejoice with trembling.
Ezekiel 22:30 And I sought for a man among them, that should make up the hedge, and stand in the gap before me for the land, that I should not destroy it: but I found none.
(NASB, ESV, NIV): "build up the wall" 
Micah 5:5 And this man shall be the peace, when the Assyrian shall come into our land: and when he shall tread in our palaces, then shall we raise against him seven shepherds, and eight principal men.
Romans 13:4 For he is the minister of God to thee for good. But if thou do that which is evil, be afraid; for he beareth not the sword in vain: for he is the minister of God, a revenger to execute wrath upon him that doeth evil.  
29 The people of the land have used oppression, and exercised robbery, and have vexed the poor and needy: yea, they have oppressed the stranger wrongfully.
30 And I sought for a man among them, that should make up the hedge, and stand in the gap before me for the land, that I should not destroy it: but I found none.
31 Therefore have I poured out mine indignation upon them; I have consumed them with the fire of my wrath: their own way have I recompensed upon their heads, saith the Lord God.