You're Welcome Hickory
I think I would use 5/8-18 threaded rod or maybe 5/8-11 and use a rod coupling nut on the top bar with two side holes in the rod nut 10-32 to hold it in place plus jam lock nuts below on the lift plate.
The 5/8 rod nuts would give you room to drill and tap the rod coupling nut on the side unlike a 3/8-24 or 3/8-16 rod nut.
5/8-11 treaded rod you can find anywhere and the nuts as well but 5/8-18 NF threaded maybe a bit harder like the rod nuts.
But you can always just drill a hole the O.D. size of the 3/8 rod nut and then put in a top plug to lock it in , if I recall the O.D. size of a 3/8-16 rod nut would be 9/16" and a center hole for the plug would be 3/8" drop it in and glue it in with some monkey glue then put the plug in on top of that.
Just some thoughts on my end.
Please post a snapshot or two after you get done with it, and please ask if you need anything from me....
Just a note*** At one time I had a Horz.setup on the back side of my old router table ( see the hole in top for the bit,in the snapshot below) but I took it off and made a router table for my son with the parts, but it's just one more way to make a Horz. router setup all in one type thing if someone is short on floor space and they have a router table now.
http://www.routerforums.com/attachments/show-n-tell/2284-just-some-shop-snapshots-rt8.jpg
http://www.routerforums.com/attachments/show-n-tell/2277-just-some-shop-snapshots-rt1.jpg
Just in case anyone needs a tip how to...

Just a tip how to mount the router and drill the 2" hole in the center of the plastic mount plate.
Once you cut the plastic out to fit the track find the center point,move down to where the hole should be and mark it,now (1/8" hol,e 1st) then drill a 1/4" hole ,then chuck up a 1/4" dowell pin or a 1/4" router bit now plunge the router bit in that hole now trace around the base then remove the plastic base plate from the router and set it on the trace mark you just made now mark the holes for the mounting the router then drill 1/8" holes in the plastic mounting plate now flip it over and couter sink the holes you just drilled then drill the holes out to 3/16".
Now take it to the drill press and drill the 2" hole for the bit hole, be sure and drill it from both sides in that way it will come out clean with no chip outs.
Now when you mount the router the 2" hole will be dead on center along with the bit.
Bj
