OK - edit my comment to this:

Use money to buy a frame with suitable dropouts so that you don't have to bust your balls (or wallet) to get the bike to work as you dream it will.

It's a great frame. It's just not designed to go fixed. With a tensioner it would be fine as a single speed.

I just think that you could get a very good price for this frame and use the money to buy something that would be much easier for you to use as FG/SS. Why do things the hard way when you don't have to? It's not like you're on a $0 budget with a junk frame as a start point.

Anyone know if the Cannondale Capo geometry is similar to the CAAD9? That is a FG/SS bike.

If the eccentric hub will make it work, then fine. Just seems to me to that this frame/usage choice is a strange way of going about it.