Arnold sounds like your off to a great start. I personally have never used these myself but I would trust Bob’s @RSJB18 recommendation for the suitcase connector as one method. My only thought is the more connections the more chances for a bad connection to develop leading to more headaches.
Personally I would consider placing your MTH Terminal Block mid point under your layout. Power it from your transformer with your 14 or 12 AWG wire. Than run from that directly to your track lock on’s. Have you determined the number of drops that you will use? Are they split equitably around the layout that would benefit from shifting the MTH or split and have two on each end? Evaluate if you really need a drop every few feet. Consider starting with less. With the organized power distribution system you can easily add one if its needed, just my opinion.
