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I'm only guessing but I would think that for what the table and fence would cost as parts for a R4512 you could almost buy a whole new R4512. Those two saws were/are also made by two different companies for TTI so that just might increase the possibility that switching parts between the two might be an issue.
Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian."
------- Henry Ford
I've often wondered the same thing. I own neither saw, so obviously I don't know the answer....I'm almost positive that it's not a direct bolt up because the R4512 has table mounted trunnions and the R4511 has cabinet mounted trunnions, but it could be possible with some ingenuity to retrofit a full size top to the R4511. Badger Dave raises a good point about the cost of obtaining a top from the R4512, but I'd guess you could try a top from an older full size contractor saw, or other full size saw. The R4511 is made by Steel City/Orion, so maybe a top from one of their saws (35605/35606/35610) or a Craftsman 22104, 22114, or 22124 might fit. The main tops tend to be a standard 20" wide x 27" deep.
Here's what the R4511 looks like without the top:
Here's a look at the underside of a few full size cast iron tops: