jolly, if you wind up doing the Muggy, I might have a mount for you. I have a 3/16" thick mount that I did for mine, but decided to go 1/4". Mostly because I had the stock and was bored. It isn't pretty, but very functional. No flexing problems either.
I say "might," because someone pm'd me about it and I responded, but he hasn't gotten back to me since Monday. If I don't hear from him soon, it'll be up for grabs. I'm all for promoting this brushless thing.
The mount attaches to the center diff at five points, and is very rigid.
***Geez, don't know what I was thinking. Sorry for the off topic/hijack.
The only catch is this. If/when you get a better mount, you pass this one on to someone else that could use it at no charge and under the same conditions.