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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.
~~Don't worry about old age; it doesn't last that long.
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: