Hiya ladies, looks like you have all been having a nice chin-wag. While you were all clucking away, I did what I usually do when the girls get together, went to the garage and did some work

Routed out the screen area of the tablet placement so I could use it as a pattern for the acrylic (not going to make that mistake again)

After cutting and chamferring the acrylic I routed out the exterior shape of the tablet and here we go...



Of course being still pretty new to routing I managed to fluff up one of the corners, but I think I can clean it up with some gentle hand work. Overall I am very happy with the way this has turned out to this point. I still have to put in a slot from the back for the power/usb cord and a 'finger' hole behind the top of the tab to make it easy to pull out.
@Wcndave - That sewing box is beautiful. Thanks for the advice. Yeah the dowels are 3/4" diameter and my platform where the controller rests is only 5/8" thick and hollow underneath. The dowels are glued into that and protrude a good inch or more into the dark abyss below the platform. I have 1/2" diameter insert nuts that are 25mm long that I plan to drop into the center of the dowels, which I will cut down to 1/4" below the flush line of the box base, I'm doing this because the neck of the black plastic knobs is 1/4" long and 5/8" in diameter, so when screwed down the outer diameter of the knob will be flush with the box base. This probably isn't the 'right' way to do it, but I think it will work well.
Very little about this cab build has been orthodox, and the creative/stubborn/smart ass/idiot/mad scientist in me kinda likes it that way. I'd much rather be known for my creativity than my ultra precise craftsmanship and deep knowledge of technique (although knowing that stuff would be great too, and I am learning a lot along the way.)
I enjoy everyone's comments, advice, critisicms and ideas, just don't expect me to take much notice of a lot of it, WCNDave pretty much nailed my personality on the head when he said I get a laser sight view of where I'm going and then I just go. MCSE pointed out that I suffer from feature creep, I certainly hope I do, because that means I am evolving as I work toward my goal, hopefully staying creative and open minded enough to never dismiss a wild idea. But I would also argue that I stick very closely to my final vision too, I don't think anyone can say this cab hasn't hit all the goals I first set out in my OP (except for cupholders).
You guys are awesome, keep the comedy coming, if it wasn't for all the people who actively post in this thread I KNOW I wouldn't be as far along in this mammoth project as I am today.