Hello!
Welcome to the forums!
I have a 1:24 Freightliner from Italeri and I have completed another truck model that is based on the Freightliner frame, so chances are I could help you - I'd suggest you post scans of the instructions with the critical portions marked (say, in pencil) - and I'll tel you what I think about it.
Hope it helps, have a nice day
Paweł