Cost of building

Maybe you can use these: https://www.wired.com/2015/08/everblock-life-size-lego/

I'm building on Water Island. We did around 80 yards for the foundation/cistern/bunker for our Deltec house. Concrete $240/yd by time on site but we had to pay for a barge. For finished formed concrete I think about $1000-1200/yd is realistic based on our experience. For per sq ft finished house we are going to be around $450-500 sq ft. This is with me doing most of it with a couple of guys helping for a week or so. Also a very minimal style, stained concrete floors, I'm making the cabinets and doors, no AC, etc. In our neighbor's experience high end appliances are a waste of money with airborne salt spray everywhere. Check out my blog www.windsheimusvi.com if you want to know more. I haven't caught up yet with the blog but we are now dried in and working on finishing the outside for hurricane season. BTW, of the 20 or so Deltec houses in the USVI only one was damaged by IrmaMaria. This was their first failure in 50 years. The house was sold/engineered to be built in Florida, resold and ended up in USVI. The anchoring to foundation was not done properly. I personally talked to the engineer who inspected it. Deltec is relatively expensive but so far I'm glad we went that way, it is so much faster/easier than anything I've built before.