I sort of, okay, I directly copied the koubalinks. It was a piece of cake. I actually designed three different lengths but made the ones that are 126mm in length. I'll be happy to supply you a drawing if you wish. They are made from 1/4" thick steel. Anyway, in order to drop the bike equally and maintain the proper weight distribution front to rear, this is probably the longest you can go on the rear and keep it from changing this as the bars will soon hit the bars if you need to drop the front end more when a longer link is used. I made to maintained the distribution by checking the level of the bike before the install and after by using a adjustable level. I simply dropped the forks until we were level again. It yielded a 1-5/8" drop in the seat height. You have to understand also that when you change the link length you also change the shock geometry too. The longer the link, the softer the ride and the easier it is to bottom. My son has not bottomed his and it definately made him feel more confident. If you want more info, I can supply it.
