Taking a guess..... the layout is not too dissimilar to the old Losi JRXS touring car. Motor in the middle of the car on the centreline, with cells in the middle too (one in front/behind the motor maybe?).
Twin belt either side of a wide layshaft to clear the motor... but where it differs to the JRXS style would be the belts connecting to a gearbox (TA03 style!), meaning proper suspension and drive shaft geometry etc can be used.
Simplicity... use the same gearbox+internals front and rear (idlers are on the correct sides if you rotate), and if you put the layshaft in the right spot, equal length belts as well. Cut down on spares, cost to produce is less... all with simple, intelligent design
