i've been trying to contact chad at ascendant to inqure him about having them build a box and send it with the Av. would this be the best route or should i just build my own box.
Depends on how much it costs. If you had them build just a sealed box with an Avalanche in it, I'm sure it wouldn't cost very much. I do know sometime in the future Chad want's to start building Snail Shells for the Atlas's and Avalanche's. When you find out whether they can build one for ya, tell me, because I'd rather them build one than myself.
if you want a ported box, and you've never built one, you may want to let him build it. if you want a sealed box, build it yourself. they're pretty easy.