Stage four π speakers weight about 50 lbs, so wall mounting is fine. Just be sure to mount to a stud. Here are some photos of wall mounted Stage four π speakers:

• The Vault - Pics

When you get the plans, you'll see that cabinet construction is pretty basic. You can use butt joints, which are a simple as it gets. Just flat panels glued togther at the edges. No diagonal cuts, no dados. You will want a brace from front baffle to rear, in between the woofer and tweeter. You can also run one from side to side. Put R13 insulaton on the bottom, side and rear of the cabinet interior. That's all there is to it!