Have you tried contacting Forge World or, possibly, the Mail Order? Just on the off chance they knew where to get one...
Otherwise, this might be a reason for labelling the FW stuff as for \"experienced modellers\"... :]
Don\'t you get the assembly instructions in the box when you buy it?, then again if you do not have these for any reason i\'m sure you could either e-mail or phone forgeword (details on the website) or maybe there are guides on the internet somewhere???