The only problem with 1/8th scale conversions it takes twice the number of batteries needed, bigger more expensive ESCs and motors, the maintence cost more and the tires are more expensive compared to using the used 1/10th scale tires from 2wd and the 1/8th scales have a problem eating expensive servos fairly often unlike the 1/10th scale using the same servo for long a time. 1/8th scale buggy don't have enough room under the body to do alot either as far as cooling and batteries needed.
1/10th scale truggy will work just perfectly with 1 2S li-po battery, a regular Novak GTB ESC with either a 4.5 or 5.5 motor that I already use in my 2wd.