I don't have any technical info to add either, just wanted to mention that my R200VLSD (Q45) is mounted similar to yours, in the first pix. That's my page by the way, I was taught that it's not an R230...Anyway, I don't have any pix of my front mount, but it was the only thing I could come up with without losing (any more) ground clearance. I just don't have the front to back bars going all the way back to the uprights. I'm also not using the lower front bar, need to add that one day. Remember to save room for your parking brake cable if you're using it.
I think my mustache bar holes are too low, my diff flanges hit the control arms-no wonder my car would stall when rolling at idle speed. I've taken out the upper washer on the mustache bar but no good...I may switch to something like Terry's as a "while I'm at it" project. Your mounts and everything look cool, but the machining must be expensive, why not go to a mount like Terry's and engineer in some compliance for your rear diff mounting? Would be a lot cheaper in my opinion.
You asked for free 3D software, I think Blender is really popular.
Owen