I totally respect your idea for your mod, I just asked because the two non ablator engines have a kind of awkward thrust value, they have too much thrust to realistically be used with just a pod/service module (I tend to try for a level of realism i.e. don't black your Kerbals out with G-forces) but too little thrust to really be used as just a launch engine. The engines with ablator are fairly good for that use. Both engines work well together with the Landertrons mod.
If I could model or code at all then I would making that engine as well as some other parts. Unfortunately I have skill in neither.
Mostly I got your mod for the pods, the IVA's are really cool, good work with them. I understand that doing IVA's are one of the hardest things to do for a modder so props to you!