if you build everything to function properly at ride hight that you want i don't think that the tire squish is going to be a problem. Think of it like this the tire is squishing, the suspension is not moving. As long as your front lower control arms a as close to parallel with the ground at ride hight during fabrication you will be fine. you will have enough adjustment in the suspension to fix any tire squish woes. There is no possible way on a project like that to know the exact total finished weight of the car and that would make a lot bigger diff on ride hight geometry then tire squish. Don't over think it. set every thing up at ride hight and adjust out. One more thing put the calculator away and have fun its only metal.
