Not sure if your found the above thread yet, but it might be useful to you. Also keebmap.xyz.
I think you’re on the right track, I’m not experienced enough to give you specifics on some of the things you’re inquiring about but I would recommend getting a hotswappable keyboard. It makes it much easier to try different switches if you change your mind, as well as modding or replacing stabilizers if necessary. It appears kbdfans offers assembly service for their diy kits as well, in that you add the diy kit, switches of your choice, keycaps and the necessary foam to your cart, as well as their “TOFU84 assembly service” item. That might give you more options, but I can understand how overwhelming it all is as I’m fairly new to the hobby myself. If you do go the assembly service route, you can post a screenshot of your cart with your chosen parts and I’m sure somebody here will be able to let you know if there is something incompatible, or if theres a better alternative. Hope that helps.