Geir
Emperor Mongoose
Yeah. That. More like braino'd. The 'airframe' - with armour - is fine at TL10+, so I wouldn't mess with the armour - except the incorrect value is what makes it overweight in the first place. In no case do you need 2 tons of power plant, though - unless we're suddenly interpreting something as no partial ton power plants all of a sudden (I'd still argue for a 1 dton minimum, but custom jobs bigger shouldn't be an issue). But... keep with the refitting rules, you have allegedly 2.72 tons to work with (or whatever it really comes out) to re-jigger the design.You can, but it sounds like the original is TL 11.
I think Geir typo'd the start of the second paragraph.
Actual the right way to do it would be to first make a 'standard' TL12 version with TL power and drives, then figure out how to mess with that design and the engineering compartment space to work up a 'legal' TL11 non-standard version. But I have dinner in the oven, and re-editing that isn't getting done, so I'll leave it for someone else...