Just for something different to do over the break, I picked this kit out of the pile: a Coopercraft AEC Monarch. I think I picked this up at a show for £3.50 simply because it was there and because I hadn't built one.
The instructions are a bit sketchy and if you have no commercial vehicle knowledge there is a bit of guessing. I'd worked out the at the chassis cross pieces should be level with the top, but the front one? I cut out the gearbox/drive shaft piece and waggled it about until I thought that it would go behind the axle and lower than the other three. Someone shout if that's wrong.