Heya.
Just go for it. It's actually easier than it looks. Plus, a new Globe cab costs about $40 these days so if things go wrong the mistake won't cost too much after all. I am really bad at building things yet my truck came out ok.
I used a disc-type dremel cutter for the straight bits and a milling-type tip on the round shapes (drew 'em on the cab first..).
And then I glued that styrene stripe on the bottom of the cab (which helps concealing imperfections).
My cab came out too clean in the front. If you have the chance to add some rivets or such do it. It looks much better. Oh.. and the handles on the front and wipers are not symmetrical on the K-100.
I didn't replicate the typical door handles of the K-100..
Door
..but I did the split windows. These are actually very easy to do.
Good luck. I hope you'll post a progress report!!
Cheers
Pip