Well done, my first widefield star shots started the same way - on a fixed tripod. I never used exposures longer than 10-15 seconds, otherwise you'd get trails. I took usually 3 shots and stacked them. Registax couldn't handle any more than that while keeping the stars sharp.
You can find one of my best efforts here:
http://www.iceinspace.com.au/images/...g-20040820.htm
and the rest here:
http://www.iceinspace.com.au/?widefield
Though they're very old now.. lately I use my EQ platform with a tripod on top. My camera can only do 30 seconds, so I take many 30 seconds exposures and stack them. I now also use registar, and find it much better than registax at handling rotated images.
A couple of my best on the EQ platform are here:
http://www.iceinspace.com.au/forum/s...ead.php?t=3732
http://www.iceinspace.com.au/forum/s...ead.php?t=3143
http://www.iceinspace.com.au/forum/s...ead.php?t=3142
Good luck!