I've got a couple of sketches for a small troop dropship, a little bit bigger than a GW Rhino.
The Dauntless OTL (Orbital Transport, Light) dropship is a conversion of the Dauntless Scout Bomber frame. The Dauntless, an obsolete and slow fleet bomber, is still one of the most robust and long-ranged light vehicles in the fleet. Removing the bomb launcher and internal magazine creates a space large enough for 12 passengers, or four heavy power armor suits, or one small vehicle. The forward bomb launcher port is replaced with a loading ramp.
The Dauntless retains its triangular cross-section and two-man crew, though the Weapons Officer station behind the pilot now faces to the rear of the ship. The twin forward-facing light cannons are low in the hull, which can make firing during loading or offloading very dangerous to the passengers.