Tony,
Not sure about the tool boxes, the DMR Group Standard tender is ok and I know he sells a lot of fittings seperate. I've heard that the Finney tender is one of the best around, but thats only what i've heard. Bioth worth a try I think??
JB,
Not sure about the 4f but I built a Gibson 3f tank about fifteen years ago and I liked it. All slot and tab and I thought went together well. the only thing I didn't like is the kits talks about cutting out the cab floor to fit a motor, so from this I assume it is very old. I think if you treat the kit as a good starting point to add further detail you'll get a cracking little engine,
ATB Mick