I just finished building that small exprimental cab with speakers at 90°. It perfectly complement the MV50 Boutique. It's interesting to have different projections in the studio, to be more aware of the room acoustic. Tone doesn't shift as you move in front of the cab. Of course I built it with recycled ¾" plywood and some pine, and a X-Man Race medal as a jack plate ... LOL I put it up front to see it Open 1/3 in the back. Two Celestion VOX VX10 30W speakers, paid $29.98 US ... for the pair. They come form Sweetwater when they upgrade AC4TV and AC4TVC.