First off! Nice work, make all kinds of stuff! you are correct 7/8 no flare. Can't find mock ups. Butt Center wIdth from outside to outside of riser blocks is 3 1/2 in. Fork width Is 5 1/2 in. Rise maybe 12 in? 17 1/2 wide at grips. 8 in pull back. From note book. Trying to stay in scale with forks! Will be trike with seat above rear axel of stock fame dementions. thanks Gary