The chemicals are not that difficult. Which ones do you need to know about? Caswell's products are great, but if you cannot get them, there are work arounds. The dyes are the only one I recommend not trying to get around. This comes from first hand knowledge.
On PS, again from first hand, CC is the way to go. I started out with CV. It can be done without a doubt but needed more attention during a run. Another benifit to CC for me was more consistant results. After switching to CC, the only problems I had were related to cast material. Alot of automotive parts use very poor material for castings. As for size, it will depend on what the largest part you intend to run. You will need to caculate the surface area.
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