Little do you know what you’re up against. 
I’ve posted a few hints on the picture thread of initial work if you want to see your competition, but I have big plans that will be worked on over the year.
Build thread will be made after the initial fixes are made and I’ve tested it though
I agree. I’ve got 6354s on mine and there is a good 3 cm between the motors of extra room. Might be able to squeeze something bigger on if you use a slimmer belt.
Make it taller and your problem is solved. Downside is it is harder to find good bolts that are long enough with an inch worth of risers. 