Well, here's a
15 year old post that describes how I lowered the ride height and extended the wheel base on the two styles where it's appropriate. I also experimented with body mounting LEZ couplers in that post, but it should be straightforward to body-mount MTLs in its place.
Since the Rapido model came online, I am ditching most of my RC centerbeams, save for the opera window style, and I'll be body-mounting N-Possibles to those. But that is a future project.