Wow, that looks great! What brand of shock towers are those and where can I get them? Or did you make those yourself? Also, your design was the "final push" for me to update my design a bit, thanks for posting that! I'm looking forward to seeing how yours turns out.
Since my motor plate bolts to a center diff mount, doesn't look as clean as it could, and probably not as strong as it could be either. So I decided to update my design, and used "The Dude"'s motor mount as inspiration for an update.....
Since 3/16'' is a bit on the thin side to drill for M3, I am going to slice a section of the bottom off the motor plate. Then, I am going to cut a piece of 1/4'' plate to the proper height, cross drill it with the same hole spacing as the current diff mount and thread it for M3, then weld it to the motor plate. Next, I will cut out a couple of tabs from 1/4'' plate, drill completely through them, and weld them to the motor plate at chassis level, then drill through the chassis to use a bolt at each tab. Finally, I will weld a thinner plate over the current hole for the outdrive in the motor plate, which happens to be the perfect diameter for the center diff bearing, and put a hole in the welded on plate just big enough for the outdrive to fit through but wont allow the bearing to go through, basically turning this into a center diff mount and motor mount with just 2 separate pieces. Simple, strong, effective, and should look cleaner than the current setup once it's done. I should have some progress on this by the end of the week or this coming weekend, so stay tuned for more updates, and as usual, comments questions, and more importantly, suggestions, are always welcome.