RE: inverted 2 stokes
I totally agree with everything the two previous advisors told you, therefore they are geniuses and gentlemen and you should listen to them and do what they say.
No doubt somebody (probably one of my friends) will chime in to insist that inverted glow engines are OK, you just have to be good enough at tuning them, which most of us aren't.
And I admire them for it, but my answer to that is righteous:
1) Tuning an inverted glow engine is more difficult and delicate than tuning it upright or side-mounted, so even guys that can do it well will spend a lot more time tuning and a lot less time flying, AND:
2) Even perfectly tuned, the margin for error in an inverted twin is much smaller: little quirks like props and fuel and fuel lines and tank problems have a much greater chance of throwing off the mixture enough to kill an engine, AND:
3) Losing an engine on a twin has much greater consequences than on a single-engine plane....much greater chances of causing major damage to the plane.
GO SIDE !