Cooked this up with a STD engine thought. You loose some speed and a bit of cooling but you gain Zombification. I haven't tried either yet, just theory crafting since it's my next chassis.
XL275 version is really good, however I think I'd prefer the STD engine on this one. I'd prefer to have the ERLL in the CT too. You lose an ML but you get a higher mount to play with, and if you get zombified, you might be lucky enough to get a bit of distance and use the range of the ERLL to your advantage. I found that you lose your arm very quickly in the AL.