"Stoopid" Simple Router Table Extension

Okay, forgive my choice of "teenage" language, but in this case it's accurate. I have been thinking and googling for weeks about how to mount a simple extension table on the standard length fence rails on my Grizzly contractor saw, and when the obvious solution finally worked it's way into my brain, I felt stupid for taking so long to think of it.
First, my needs are simple, and I plan to use the table saw fence (with t-slotted sacrificial material)for routing, so I didn't need to add a large extension.
Second, I need to get up and routing quickly for one specific project so I don't want to take the time and effort to make the ultimate router table. Legs, hinges, leveling etc. are not all that difficult, but add a lot of time to the build. I'll probably end up using this first table to make its more elegant replacement.
Try as I might, I couldn't think of an easy way to get the table attached to the rails for a solid and level fit. Since I accepted the fact that this first table would most likely be modified/improved in the future, I wasn't fond of the idea of drilling holes in the rails, not to mention the headache of removing them and wrestling them onto the drill press. Plus, mounting any hardware on the rails has to be done strategically to avoid interfering with the fence. Finally, the front and rear rails each present different problems with clearance, shape, and level.
I had pretty much given up and decided to go get Rockler's $109 (no insert) table to clamp into my Workmate. On the way to the car, I stopped at the table saw to give myself one more chance to avoid admitting defeat and burning the cash, and it came to me!
Setting a piece of 3/4" MDF shelving across the rails, I saw that the MDF was about 1/10" proud of the table surface. (The top edges of both rails are the same height relative to the surface, and the rail stock is 1/4" thick). I cut one piece of the MDF to slip exactly between the front and rear fence rails, and cut a second piece 1/2" longer to rest on top of the rails (1/4" on each end). Next I routed a 1/10" deep rabbet on the edges of the longer (top) piece to bring the surface down to match the table height. Laminated together,with the top piece overhanging the bottom, The assembly slips perfectly between the rails with the top resting comfortable on the edge. It can them be held to the lip of the tabletop with bar clamps placed underneath.
Before "laminating" the two pieces, I cut the hole in the bottom piece and mortised the top piece underneath to accomodate the router. Finally, I made the dado for the store-bought t-track channel and I'm done. I bought an insert, but for this first attempt, I'm just going to mount the router directly in the table.
The extension is only 11" wide, so I'm limited in the width of stock that can be edge routed with the fence on the left, and the feed direction will be from the rear of the saw. You can't go much wider because the rails don't extend that far. For larger pieces I'll have to change the fence over, move it to the right, and feed from the front. My upcoming project will not require that.
The whole job took about 2 hours, and that included teaching myself how to use a router, and several practice passes. Most of you folks could do this in a half hour, including the routing for the insert, which I skipped. In the next version and add the insert and make the top out of Melamine. By then I'll probably have a better idea of the perfect location for the t-tack as well.
This or a slight variation will probably work on most fence systems. If you've been thinking about adding a router extension to your table saw, this is a great start, and it's so easy that you won't mind if you want to remake a nicer one in a few months to add features.

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