well i havn't even put a chain on it yet. Basically i've got the BB and Crank it came with and i bought a second hand track wheelset. I used a bit of string to determine whether the chainline would be straight and it isn't at all!!

When you say measure the chainline, how do you mean? can i do it without putting a chain on? It seems that the hub is too narrow!! even if i tried to space the sprocket, there wouldn't be enough thread!

but i'm guessing loads of people do this, so there must be a way?