I don't think you can really call this a tutorial, but I think this still is the best forum for it.
Anyway, I found these in the game.exe file (and I know SMIFFGIG also posted them somewhere on TumSun before)...

I ordered them by the number of cells they occupy
0x0
1x1
1x2
2x1
1x3
3x1
2x2
1x4
1x5
2x3
3x2
4x2
3x3Refinery
3x3
2x5
3x4
4x3
2x6
3x5
5x3
4x4
6x4

I don't get it with that 3x3 Refinery

its 3x3 with the 8th section missing. (if you count from north to south and west to east)

I'm sure the harvester drives backwards into the refinery when you set the refinery foundaition. I ll have to test it again (Its that long scince Ive tried it), but I think thats what happend.

Nope, units don't move backwards in TS, no exceptions. You must've confused it with TD

Hmm you right. I'm not quite sure myself where I got that Idea from. Maybe it was TD, I did test it a long time ago...

Got a picture of what 3x3Refinery looks like, for curious people ^_^

ah, i see i was right. ^^

this is how i numbered it: