If you want to ask me a specific question please send me a PM as I don't always go back and read messages that I may have put an answer or thought into.
1. As for a universal refrigerant, never heard of one. My understanding has been that the only successful way to convert is to have everything vacuumed out, including oil. Replace connections, receiver/dryer, o-rings, add pag-oil, and fill with R134.
2. Sheet metal is good but shipping to Canada is always restrictive, send me a PM on exactly what pieces you would want.
3. I've still got one climate control available, listed in the parting out section:
** Parting Out Red & White 91L automatic sedans, Phoenix AZ **