Just a short note that there were two different TONDA kits of the F15 with No. 11 cab, both vehicles were identical but one was, as mentioned above, resin, and the second (or better said, the first because it was issued earlier) was vacu-formed. I do not like to resin kits so I always preferred the vacu because you may use the same "technology" like with those styren injection-molded kits. But it is necessary to say that both TONDA kits, as well as all the other ones (Bedford QL and OY cabs, Russian GAZ and ZIL trucks and many others) were not the best and required a lot of effort. But on the other hand, to get the No. 11 or No 12. cabs from the Tamiya Quad is not as difficult as it might seem. It is only necessary to narrow the front end, make a new cab floor, rear wall and roof, but do not forget about a new windshield, do not use the original windows (I have seen it in several cases and such cab would be too high). If you are interested in drawings there was nice one in British MAFVA magazine. If you are not able to get this just let me know and I would send you a copy via email.
Happy Modelling, Jan (IPMS Czech Rep.)