I really wanted to do it with the inside dimensions at 24x48, but it would waste so much wood that it would drastically increase the price. I felt trimming down the size made a lot sense vs charging WAY more for the product. It almost comes out to twice as much for material for that extra 3/4".
Makes sense, low volume production vs high volume production doesn't always translate well. In my case when I built the frames I spent an extra $10 at Home Depot, which by itself isn't a big deal but if you aggregate that over many frames it adds up.
Assuming you guys cut the insulation on a regular basis for everything you build in-house, if I were to order a DIY frame for next time I'd happily pay a nominal fee ($5-10) when ordering the OC to have it pre-cut to fit in this frame. Doing that part at home is messy, itchy, and just generally annoying. If you have the capability to do that in house for the customer I would have to think it would be a pretty high margin service for you.
Only other thing I would add is it would be great to have a tutorial on your site. Not looking for any of the "secret sauce" behind your special products, but for something like a DIY panel with your premade frame, it's basically shove insulation in frame and wrap with fabric. The wrap with fabric is where I spent a LONG time online searching forums figuring out the best way to wrap around corners, cover back, etc. I think a quick primer on that would be very useful for newbies.