That is a great looking design.
The CP shape is a good part of the design and I think that if you made it a rectangle it would loose some of it's charm. You could get rid of all the compound angle cuts by keeping the shape of the top of the (plan view) and then instead of having the bottom of the CP box sit level and the top at an angle, make the top and bottom parallel to each other and mount it at an angle. That way you only have to rip the front, back and sides of the cp to their height, cut the appropriate angles on the ends with a chop saw and assemble.
I think the dedicated 4-way is a perfectly acceptable solution, but I only have 4/8 way switchers now and think I'm looking forward to GGG's SLOWLY approaching 49ways. The only modification I'd look into for your design (other than simplifying the CP angle) is the depth of the CP, find out what the deepest components you'll be using are and go as thin as possible with the box, it looks to "heavy"(not physically, aesthetically) right now (I think.)
I look forward to following your progress whatever way you go, and enjoy what seems to be a subtle sense of humor hiding in your posts.
<

>
Not all theatre scene shops are "Just" theatre scene shops
Our shop at the Seattle Rep is fairly well equipped , although it allowed me to earn 4 stitches yesterday.
</

>
OOPS, that probably sounded defensive, I spend too much time dealing with people who don't think I know anything about building because "ALL" I build is theatre sets. Two shows from now we're putting 30,000 gallons of water in a custom built pool on stage (actually IN the stage, but you get the point.)
I probably said it in a PM previously, but welcome to the forum and I'm sure you'll find several of us theatre folk hiding around here.