I’ve got SKS P35 chromplastic guards on my fixed, which is fitted with 28mm Vredestein Senseo Extreme Weather tyres.
However, depending upon the clearance between the tyres and the Paddy Wagon’s calliper brakes, you might be better off with the Bluemels version (also made by SKS). The SKS P35, P45 etc. have a squarish section, and the arms of a rim brake can hit/press against the corners, which limits how close the guard can be mounted to the underside of the brake (and consequently how much clearance there will be between the guard and tyre).
I believe the Bleumels version is rounder in section, and so can be mounted closer to the underside of the brake, giving more clearance.
Since the Paddy Wagon has rear facing track ends, I would suggest getting an extra pair of Secu Clips for the rear mudguard, which will allow you to pull the mudguard stays quickly from the clip when you need to remove the rear wheel, e.g. to fix a puncture.
As for reflectives and (longer) flaps, just fit them yourself. You can use a cut up piece of plastic milk bottle or damp proof course for a longer flap.