[Lmackattack]

Here are some stock Dims for the flat bed
the "L" beams are 2mm thick,
Spacing inside the rails is 60MM (64MM out side to out side)
the overall height at the rear of the trailer is 41MM. It tapers down to 31mm for the landing legs then tapers down again at the nose of the trailer to about 14mm for the king pin plate.
the flange is 15mm

I simply copied these dims but stretched the trailer to what I wanted.


Hope this helps