Forgive the newbieness, I tried looking at the MTBR SS FAQ and Sheldon's site but couldn't find an answer.

I've never worked on wheels before but thought I'd give it a shot. I have a rear wheel w/ a shimano freehub that I want to convert for use on a new frame spaced for 135 mm. (It's an Il Pompino). I'm trying to stay in a budget, so I've got an Open Pro CD's as a spare wheelset. I know I can use a fixxer, but I'm trying to keep this low cost and I'm OK w/ starting out as SS. When I can afford to, I will get a true flip flop wheel set.

1) Is this as simple as changing the axle to a longer one, assuming I center it correctly?
2) Any sites that explain how to change the axle? Is it as simple as just unscrewing it?
3) Any leads to where I can find a 146 mm axle? Sheldon's link doesn't sell it anymore and I can't find any axles this big.

Thanks.