At the point, the model weighs 9 1/2 ounces

Just started putting mine together Mike. I'm a little confused, was there supposed to be 1/8 ply doublers for glow power included in the kit? All I got were 1/32 for electric.  Do I have to make my own? The 1/32 are no good for mounting an engine.

Rich

I'm currently building the same ringmaster. I have had very good luck using only 1/32 ply for glo engines on ringmasters.  On this ULRM I'll be using an os 20fp. I'd like a veco 19, but I I'd have to buy one. I add the little plastic mount pads under the engine, then I run 4-40 bolts through a T-nut on the other side. Then use a ny-loc nut as a jam nut and cut the bolts off flush. I have lots of ringmasters, several are made with the 1/32 ply doubler's and I've had no issues with stuff coming loose.

Here's a little comparison. This scale is not modeling accurate. It's at best to the nearest 1/4 oz. 
The first pic is the new ULRM. It's 3.75 no sanding and the engine mounts still too long.
The second pic is an original sterling kit. It is 3.75 also. It is finish sanded and there's no canopy. It's not getting any lighter. I think I can trim an ounce off the new ULRM pretty easy.