I've never purchased nor even seen that particular kit so I can't tell you much about it. But I do work a lot with resin and metal kits. First of all, as you noticed they are expensive. You'll need different tools, techniques and materials to work with them kits. Superglue is probably the best thing to put them together, although others might recommend epoxy. You'll need good strong blades to remove the feeding block from the actual parts of the kit. You'll need files, sandpaper and finer blades to clean/scrape molding lines and any flash. You'll need to be very careful with resin dust as it's highly dangerousto your lungs, so if possible, when sanding, use water to keep the dust from going everywhere. You'll need filler or best milliput epoxy putty to fill in any air bubbles that might appear on the surface of the kit parts. The very best resin kits do not have many air bubbles, but most do. Priming the model before painting is a must. You may end up with warped parts, but do not fret, place the offending part under the warm water tap and bend back, gently, into the right shape.
Of course, we need to be real happy that this type of kits are on the market, because it opened the door to many 'globaly un-marketable' subjects. The Maquette kit is a mixed media one, I think, with a plastic hull, and resin/metal bits to build the superstructure. If you are a bit shy about scratchbuilding, and really need this T-122, then go for it.
Check this likn for some pics of the beast!
http://www.panzernet.com/galeria/t122mig/t122mig.html