Dh and I have done 2 properties, not for profit, just homes that needed work. Luckily no structural work but in this house alone for example kitchen extension, double garage conversion, new boiler & new radiators, double glazing throughout, sofits and facias. New kitchen to go into the extension, new flooring throughout and bathrooms. Plus a bit of roofing work. Every room decorated.
I am a SAHM, here to supervise any works being done. Never underestimate the head space for just choosing a kitchen and everything that goes in it, cabinet design, layout, appliances, which sink, which tap, which worktop, what splashback, upstands yes or no, what flooring, what lighting? I am able to do all this because Dh and I have been together almost 25 years and I can pretty much guess what he likes so I short list everything. But it takes time. Time you do not have.
It sounds like a great idea but it can feel relentless when you have people in and out and you don't get to enjoy it before moving on to the next project. Dh and I can fit bathrooms, tile, simple electrics, decoration.
We have taken our time with this house as we are here for the next decade. Your Dh is crazy.