I am building another M163 Machbet. I tried to get the Hobbyfan interior set but keep getting outbid on eBay.
So I am going with the Verlinden interior for the M113, the long OOP Eduard M163 interior and exterior sets, and some scratch building. The base kit is the Academy M163.

Rear area with fuel cell and ramp lift. Added the fuel lines with cut off.

Here is the wall ammo container and ammo bench.

The base of the gun system and ammo storage.

Inside of the roof.

Ramp catch activator, towards the front of vehicle.

Ramp catch hook

Roof top.

Roof top details.
Comments always welcome.