Well having procrastinated rather a lot I have finally got round to (almost) finishing this off. Here's a few photos.
Workbench with fence mounted. Several angle brackets bought from Screwfix used to fix the short rail from my TS200 tablesaw (now replaced on the saw with the long rail that comes with the extension table). Had to buy an additional clamp to mount the fence to the rail but otherwise just used spare parts from the saw (which comes with both a long and short rip fence, currently using the long one on the router table and short on the table saw).
IMAG0187 by
Orion801, on Flickr
Opening cut out for insert plate and NVR switch added. Not the neatest of work with the router unfortunately but does the job.
IMAG0211 by
Orion801, on Flickr
Insert plate - router is held in place by two screws into the template guide holes which are then secured with some nyloc nuts. I've also made a clamp as suggested earlier out of some offcuts (only one completed in the photo as bottom section of second one is being glued in place. The final assembly has one on each side).
IMAG0206 by
Orion801, on Flickr
Close up of the clamp.
IMAG0207 by
Orion801, on Flickr
Finished table along with a test piece with a couple slots routed out. I've used some sections of 18mm ply held in place by some spigot clamps to create an auxiliary fence. I've also drilled a hole in a jubilee clip and fixed it to the t-track on the top of the fence to allow me to hold a vacuum attachment in place for dust extraction (still makes quite a lot of dust but seems to pick up most of the fine particles which is what counts!).
IMAG0218 by
Orion801, on Flickr
It's now in a fully functioning state at last which is nice. I still intend on routing out a channel to fit some t-track parallel to the fence which I will then use for featherboards and jigs. I may also route out a second channel that my TS200 mitre guide will fit in (unfortunately a different size to the t-track for the featherboards).
I'm very happy with the initial results, it probably isn't as accurate as a shop bought one but is certainly a hell of a lot cheaper as well as having the satisfaction of knowing it's something I made myself.
Thanks to everybody on here for all of their suggestions.