Hvu - that's a very nice system; your choice of components is exactly what I would have picked. Unless I'm mistaken I believe the Plinius has a phono stage; are you planning to add a turntable down the road?
Highend64, I plug plinius directly to Panamax. Timrhu, I buy wood (1"x3" , 6ft long. The actual size is 1"x2.5"). Then, I cut it (for one panel) as followed: 2 pieces of 24" and 2 pieces of 50". Screw them together with drywall screw. If you have someone helps you out, the process is much faster. Remember put wood clue between joint.
Next step is cover the Fiberglass with white bating from Walmart. Now, you can put covered fiberglass into frame. Cover the frame with burlap (also from Walmart). Last step is cover the back of the frame with any fabric.
I got most tips from forum audiocircle.com ( Acoustic section). I hope this will help.