Official rules, as already mentioned, is the drawing is totally random. The mini essays don't matter a bit, just a step to entry, probably to keep spam-bots from piling in a million entries all at once.
24 drawings in all, with the cost of each prize not to exceed $115k.
After that amount, winner is on the hook for any additional cost/options, etc. There was other verbage about background check, proof of insurance to take delivery, legal stuff.
I dont recall any of my builds hitting that threshold...most were in the $100k - $107k range.