Heres the dimensions and also some photos are there always really helpfull
Length 104mm
widith 95mm
Height 31 mm.
As the pictures show, youc can get 2 layers of aa batteries arranged in a 6 by 2 formation so 24 aa's intotal, but thats not allowing any room for wiring.
And to dismantle the tender its simply 4 screws to remove from underneath.
and the coal load just pushes out from the inside.
Alao in the photos is a lgb fieldbahn bolster wagon, as it helps to provide a size guide.
Photo 1
side view to show the size of tender
photo 2
Underneath view
photo 3
enhanced side view
Photo 4
Show body removed with aa placed in to show the size.
Hope this helps
Dan