After reading Arbor Solutions post it made me think. If it didn't turn out like you figured then what? Maybe choose from a few different basic belts and add on from there. Like leg straps, tool loops, and bridge would be interchangeable. The belt would be fitted according to body type, fat, tall, long legs, long torso, etc... Should be some reading to determine how to decide what would hold you in position best. Then order some legs straps and your bridge and whatnots try them out and if they don't work for you send them back. There could be a discounted section for used parts sold slightly cheaper. Of course the bridges would have to be new. But most climbers would know which bridge they like by the time they purchased a custom saddle.