...and I've been told that this is the place to get them answered.
At the moment I'm not planning on the full uniform or anything (but never say never) however... today I bagged myself a sweet PR kit off the RPF and now I need help because, well, I'm knida new. Maybe the rest of the kit will follow but for now i want to focus on this rifle.
I've searched the forums as best I can (while waiting for my membership approval) and with such a huge amount of questions finding answers in amongst all these threads is rather daunting so please be gentle with me if I'm asking questions that have been answered a million times before. Anyway here goes:
This is the kit I got today:

I'm told by the seller that it's: "A Matsucorp cold cast aluminium kit with sd studio's metal stock, barrel vents and barrel holder." The kit included, cold cast shrouds, cold cast Thompson with metal detailed bits and all moving part. Cold grenade launcher which actually racks.
My first question is about assembly. Basically HOW? Assume for a moment that it's been stripped down, a little sanding work done (it's already VERY good), painted the correct colours and fitted with a counter (I'll get to that later) and is ready for final reassembly. I can see obvious solutions for mounting the stock, the barrel is threaded so will just screw directly into the Thompson body. The heat sink will screw/glue on to the grenade launcher just fine. Finding a way to screw the barrel holder down looks tricky as there isn't much space between the fixing point and the collar the barrel passes through but I'll work something out but
how do I securely fix the grenade launcher part of the kit to the rest of the gun? They slot together but I cant see any way of fixing it really securely? Are there instructions for the Matsucorp kit I can download somewhere or am I missing some sort of bracket (everything I got is in that above first picture)

2nd Question: Where can I get a cheap LCD ammo counter (static is fine) and how much should I expect to pay? I saw some on a site for about $30, does anyone know of a UK supplier?
3rd Question: Paint Colours. I have read some debate over the shroud colours, am I correct in thinking the "Bess Brown" colour is screen accurate and the "Drab Olive" is more how it looked on film? Personally having seen pics of both I prefer the Drab Olive. What are the other colours of the gun, is it all Matt Black apart from the shroud? Which bits need to be left silver? Is there a definitive detail on what bits need which colour?
4th Question: Thompson magazines. My friend has a replica Thompson, we tried the mag in my kit today, it's too long but the little cap that covers the bottom of the kit fits perfectly to his mag so do people just cut magazines down to suit? Where can I get a replica Thompson magazine on it's own? Is it just replica weapons that you have trouble importing in to the UK or do you also have problems with magazines too?
That will do for now, I'm sure I'll have loads more as the build progresses so expect to see me around and keep an eye out for photo updates.
Thanks in advance for all your questions and I hope I've not made too much of a nuisance of myself already with all these "n00b" questions!