These are all in resin, so you need superglue or 2-part epoxy glue to assemble them.
I don't think they look too bad assembly-wise, although I can see getting the two-handed lasguns-and-arms parts onto the body being a fiddly pain. I also haven't seen many armies made of Victoria's models around the internet either, so maybe other people are also put off by the assembly?
I guess if you don't mind pinning they should be simple (if somewhat labour-intensive) to build securely. Personally, I'd be tempted to get a loose fit between the arms and body via a bit of filing, glue with a couple of dabs of thick superglue, pin through the shoulders into the body once the glue is dry, and then tidy up with a little bit of Milliput (which you can smooth under a warm tap before it fully cures to avoid filing it smooth afterwards). That way you get the fit/pose via the loose fit and thick glue, the pins hold it securely in place, and the putty gives you that nice finish. I'd do this assembly-line style to a few squads though!
What puts
me off is actually the price (£30 plus shipping per squad, plus the inevitable Customs spanking!) given the numbers I'd likely need for even a smallish IG-style army.
