2) I didn't. I've set the White Balance manually in the T2i, using Magic Lantern. I think it was set to 5500k or 6000k. That way it achieve a proper white on a side and it gives a more golden tint on the other.
3) About ambiences, I really like that one (took during the day, white balance set to ~4000k):
2) I never bought some tomato can before, but the idea is basically the same. Only the size differs. Best would be to have multiple sizes and color temp bulbs.
3) Yeah. As it's metal and not plastic like the previous version, I thought about it:
Unless I'm very not good, this should be properly done...
They should form a pentagon on the outer and a single double socket in the middle: total of 12 lights. I'll have to change the switch if I put more than 23w bulbs because that one can only handle 3amps.
Oh, and about the wiring, I only had orange wire left, so I had to identify it with tape (yellow and black). Not that it changes much, but it has to be wired carefully before testing!