I've only had normal 103s but man I swoon over the rigid. The main benefit if I remember correctly is its super easy to throw a big dick carb with a big dick intake on those. Weld up a blk johno style intake with the big ol dong hangin out the side. Sorta like a curved av10 intake. Ya don't need a dodge the swing arm n shit thus freeing up a lot of space.
Sounds like it's gonna be a lot of fun. See you space cowboy.