Interesting to see the loco stable in use, as the vid was done back in 2011 - the green Mallet looks like a scratchbuild, and the 6101 Pfiffi appears to be the KISS one..... by now he's probably got the pair of TL45 Mallets, though I doubt he's bothered with the plastic Pfiffi (nice though it is) when he's already got a brass one!
One of the "unstarted projects" (read: vague ideas) that I've had for ages is to build myself an SkL24 (or at least something that looks vaguely acceptable as one), as I don't feel like blowing six or seven hundred quid on the Frey model..... reckon one of the "long" LGB motor blocks (the ones with the idler gears, as used on the RhB Tractors), of which I have a spare knocking about, and a couple of cut-about LGB low-sided wagons would get close enough with a plasticard cab.
Jon.