No better or smaller than your Bassic.
The better parts not a worry, I know it won't do bass nearly as well or the same. Size wise, it needs to be 20 wide. Also, no porting so that removes 7" of space.
20" wide
18" tall
9-10" deep
Give or take for sound. Then it would fit better in the living room. An idea I just had would be turning the 50 watt head into a flip top to fit and flip out from the cab.