So what do you plan to make it out of. What tools do you have available ? This is more important than the plans themselves. You need to right tools to cut arcylic tubing, router, good table saw are all required.
Most ( including myself ) have made plenty of DIY skimmers that work okay at best. By the time you account for the multiple revisions of your project and the time, honesly your better off just getting one. For the money and performance ( for a tank up to 90g ) a turboflotor sump version is pretty tough to beat you can find them used quite often, you want one with a
ocean runner pump prefered over the rio. There are lots of better skimmers but be prepared to spend $300+ for those.
