Don't you think that build would be not so much about being a combat engineer and more about being able to cast every arcane, psionic and divine spell?
Just saying.
Oh, and remember, you could always be a ghost, then you can forget about CON and Str, and pump your other scores like crazy, actually you could be 18 in all stats if you go with ghost.
I had a regular warforged gestalt shaper/constructor//artificer, and he could handle anything with a bit of effort. Seriously, he was so versatile and powerful it wasn't even funny.
In the end I had to make another character because he was just too good.
Give Lycanthromancer a day and a few hundred gp, and he will build you a lever powerful enough to move the world.
Who needs gp with infinite [free] wishes?
A few hundred gp is easier to scrape together at level 1.
You only need a lever at low levels anyway, because at higher levels, you have class features that can move the world.