I dunno why your in such a rush to brick a good phone, The warp is 1 thing a cheap phone to brick that's been around for ages and a dime a dozen but i wouldn't jump to risk bricking a $300 phone and having a expensive paperweight. Especially considering their is next to zero stock on these still in most areas and stores so if you brick it perm you aren't going to get another 1 anytime soon.
You kiddos must have way too much money to burn lol and their isn't a single rom for evo design that is worth a sh** anyway i have seen and read thru them and they all have bugs and other issues, So why brick a perfectly good working phone just to unlock a few customizations but bugging out so many other things in the process lol. At least with the older phones roms have had time to be perfected and stable, I know sprint had the design before boost did and has been around a while but their still isn't any roms out their that impress me enough to root my perfectly good existing phone for what there rom offers. I'd wait for something worth rooting your phone for.