i love a good double triangulated 4-link!
have you seen the 4-link calculator spread sheet? here's a link to d/l it if not. use it, trust it, design with it. small changes can be the difference between a good set-up and a great one! i always suggest making the upper link frame mounts with adjustable holes so you can change the anti-squat if needed. set up some holes below 100% estimate, and some above, or around whatever range you are shooting for.
https://www.crawlpedia.com/files/4_link_calculator.xls
when i did the trailing arms for my 55 i wasn't going to run it, did, and 6" longer links made a HUGE change to a more correct geometry.