brake ID and wiring
I think that any parts list you might find for Stires or Arizona trikes would not help you; neither company is around. I have no idea who owns the rights to those molds and parts now. If you are missing parts, you will have to either fabricate or find a replacement from someone like Possum Pride trikes.
To help ID your brakes, see this page:
https://www.thesamba.com/vw/forum/viewtopic.php?t=550290&start=0
The pictures are missing but there is valuable information there for identifying the parts you need for the brakes.
Not knowing how comfortable you are with wiring and what you are starting with (what is already on the bike and usable and what needs to be done to make it right) makes it difficult to advise you on a course of action. If it is truly FUBAR, I would replace it all. You can find relatively inexpensive kits (EMPI makes one) to provide the wires and a new fuse block. If you want to update to blade fuses now is the time to do that.
Here is an EMPI harness with a wiring diagram that you should be able to modify to use for your bike:
https://dunebuggywarehouse.com/wire-loom-kit.html
Just delete the extra headlight and wipers. That diagram is set up for a VW speedometer, where all the dash gauges and warning lights lived. Easy enough to work around with stand alone gauges by following where the wires are going from the speedometer.
If you are running an alternator, the AMP light, filament type 2W, is absolutely essential. See this article:
http://www.vw-resource.com/alternator_wiring.html#alt
Let us know if you need advice on 'how-to' splice, solder, etc.