I bought all sway-a-way stuff when I got my first Beetle (a '65), but that way when I was reading VWTrends and Hot VWs like it was the bible. The CalLook tends to have less expensive bolt-ons than GL, and I was a poor high school kid just getting into it, so naturally I went with what I could afford. Now that I've seen the light and found this site (and the Eurolook forum on Shoptalk) my plans changed. Money is almost no object here, hence the Porsche parts on almost everyones VWs. You can pick up any of the above mentioned magazines and look up the prices for most of the parts he is offering. The prices have come down a little, but the parts themselves haven't changed since I've been working on my Bugs ('96). If I hadn't just bought a oval body for cheap, I would be building a Super instead.
As for the spark plugs, check out this site:
removable apron and side walls . There are pictures of a good mod if you are willing to weld a little. Although, I can't understand why this person used what looks like a rubber mat to fill the hole. After going through the trouble of fitting the square tubing, I would've put in at least some aluminum plates.
How many miles on the engine? Did it leak at all when you added the Mobile 1? I've heard of older engines not liking the synthetic stuff because it seems to penetrate the seals a bit further.
Anyway, I hope this helps. Good luck with the new project.