I'll resume what I know so that you don't have to writte unecessary stuff:
On the Cyberstorms you just change a jumper, change chips and it's ready, as far as I know. You must copy the 060 libs first I think.
By I haven't found info on the Blizzards. They are the same board(1240=1260) only differences, and what would need replacement is:
1-Processor!
2-Voltage power supply (5v for the 040, 3.3 for the 060)
3- Oscilator, 040s use 0.5x multiplier, 060's 1x.
The only REAL problem seems to be the voltage.
Phase5 acutally received boards to convert to 060s at some time. The name that comes printed on the Blizzard 1240's is actually Blizzard 1260. Even the manual is the 1260's one. There's was also info on an additional sheet that states an upgrade kit would be available.
Has anyone actually done it?! And could you send me a private message on Amiga.org with link please?(going out for some time and would like to have that info when I come back :-D )
Cheers