Hi.
What engine/ spec are you going to be running?
The Type 9 is probably the easiest conversion and will be fine for up to 180 odd hp I believe. It is just a case of removing the original gearbox mounts, moving them 50mm further back and moving the shifter hole in the floor. You bolt up the 2L bell housing and can use the same speedo cable, standard length single piece tail shaft etc The ratios are the same as the standard 2L 4 speed, but there are kits you can get with a taller first gear from the uk and SMCKA Performance I believe.
I personally wouldn't waste your time with a W50 box, I run one in my car and I have never liked it.. mine is a nasty shifting box and I am always damaging syncros. It will take a lot more punishment than the T9 though. If you are thinking about using a toyota box get a hold of one of the later alloy cased W series boxes, they are much nicer.
I would look to the UK for rubbers, there are quite a few companies that sell them over there.
Roll cages, hopefully someone from your area can recommend a good fabricator.
I use Volvo four pots and bmw E30 discs on my car (very common conversion), they probably aren't the best, but they are good for a budget set up.
Pedal boxes, lots of kinds out there.. easy to get off the shelf ones suitable for both cable and hydraulic clutches. Try to get one that is based around the original pedal box. I have a Gartrac pedal box in my car, it is fine.. but was pretty pricey. Some of the cheaper pedal boxes out there flex way too much. They are pretty easy to fit, just a case of bolting it in and plumbing it up. In my Mk2 I had to build a brace for the firewall as it was flexing too much, as the factory booster bracket is braces the firewall. Lots of people seems to get away without bracing the firewall, so I am not sure what I am missing.
You should be able to get a front screen from your local windscreen mob, give them a call you might be surprised.
Hope this helps somewhat.
Cheers,
Damion