Sir - if that is the information that you have received from Maxitrak, then I apologise for getting it wrong. Over here in UK we run 5" and 7.25" gauge dual-gauge at a local club, and the non-Maxitrak-built version of 'Alice' looks just fine to us on 5" gauge track. Remember that Hunslet built this type of loco for a variety of track gauges, from 18 inches to 2 foot 6 inches, although most of the examples examples still in existence here in UK are 2 foot gauge or thereabouts.
Go buy it and enjoy in good health - it's certainly the cheapest model of its kind that I've ever seen! If I had the smaller gauge stuff Id have one like a shot, but sadly my 7.25" gauge Ffestiniog diesel 'Harlech Castle' loco is built to 2.5inches to the foot, and my own society track is to this gauge.
tac
http://www.ovgrs.org/