Ah, missed Supertrain this year, just too much going on that weekend. That is a really stellar table project however. Makes me want to try that (I've always loved N scale, you don't see it very often).. hahaha, almost. I have about umpteen projects to finish before SHeWhoMMustBeObeyed would allow a new a project. Oh well.
Cool beans on the upgrade. A 40g breeder is a nice size for a small reef - you will like the dimensions 36x18 (no comparison to your 10g) and the short stature allows more light penetration into the tank. You see 40g breeders used as frag tanks very often for that reason (in fact that might kind of be one of my projects, haha).
With the black trim, I find very often these things are sort of prefab'd out of standard parts. For example, the tank builder probably used the same trim on a 65g tank which shares the 36x18 footprint size but is more like 24" tall.
But a 40g breeder tank is more like 12" or 14" tall (if I recall correctly). You probably don't need a brace as much as you would on a taller tank. So you might be OK. There might be some bowing / deflection of the glass in the longer direction but not as much as there would be in a taller tank.