Excellent frame for a fixed gear. Light, aggressive geometry, and good components.
Very snappy performance, and the condition lends itself to a banger, in my opinion.
You can easily sell the shifters, FD and RD (lots of market for 6-sp indexed, in general)
The front caliper, light, and good for a single pivot, will stop you, but not like a dual-pivot.

The wheels, if you plan to jump curbs, etc, will not hold true, as they're pretty light.
If you true and tension them, they should be OK. Tire clearance? you're probably at 25c max, 28c if lucky.

If I was gonna fix-gear that, I'd probably eschew the "kit" and get one of those screw-type tensioners you can add by drilling a hole on the dropout and bolting on. Then I'd make sure the wheels were "right," add some 25C cross tires, and put flat bars on it and keep both brakes, use some $10 Avid levers. Get a master link for the chain or a new chain with one. Keep the crankset, run the small ring with single-speed bolts on the rings, or washers. Add a cheap seat post, a saddle, and some black grips, yellow housing from China.

Figure spend $60 on a rear wheel, $50 max on everything else, sell the shifters, FD, RD, brake levers for at least that offset, and ride it.

I have sent IM frames to a messenger friend in Quebec, and he says they're great urban attack vehicles.