I was looking at this plan the other day... seems pretty good if
directions are followed...

A- Are all of your disks round and of the same size?

Yes. I cut them all with a router.

B- Did you follow the instructions regarding truing the drum on the
sandpaper attached to the bed, or whatever?

Yes, that's what I'm trying to do, is to true it up by putting
sandpaper on the bed.

Max had a suggestion that I was taking too much off at once... That's a
possibility.

I was thinking of turning the drum on a lathe, but that's a precision
chore... maybe truing it up on a lathe or DP after it's glued up?

I don't see how that helps. The point of truing it is to make sure
it's parallel to the bed.

As far as cost, pretty minimal. I built it out of 2x4, except for the
support for the pillow block bearings, which I used Ash. Bought the
bearings on ebay for under $20.

Also bought the motor on ebay. 1.5 HP, single phase, for $50 plus 15
for shipping!

The table I already had from another product. 2" thick, with a
laminate. Maybe spend another $10 on hardware for the lift mechanism,
already had the piano hinge... The belt and pulleys were perhaps
another $20 from an online place... So maybe I'm into this $125 with
motor??

It'll be interesting to see how well it works.