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the tub, 7' x 3'-6", will be tiled in place, and the roman tub drain im using is the 2 part plastic with brass lift & turn by oatey that accomidates membrane / hotmop. 2" to drain (new)
it will have 3/8 stone over thinset over 1/2 wonderboard, and I was looking for an overflow that can either be taken off a tee on the tailpiece or tee off the tailpiece to the drain and rise out the top of the tee to an overflow. have you ever roached the overflow from a tub w & o and installed it?
If I understand it, and the drain is 2" it's best to keep everything the same size. Come off the drain fitting with a street 1/4 bend, run horizontal (with fall!) into the side of a sanitary tee, up from the san tee to the overflow fitting, down from the san tee to the trap. Don't put any other fittings in but those: drain, san tee, overflow, then down into the trap. I've seen some guys do offsets that will only cause problems later. One other thing to consider: That overflow should be as large as you can make it. I've seen SO many of those tubs routinely over-filled and, unless the entire bathroom floor is membrane, it causes long-term damage.
I don't see any benefit from robbing parts from an existing tub drain, and many reasons NOT to go that way. If the drain you're using is only 1-1/2, you should still try to get up to 2" as soon as you can.
(Side note: As I mentioned earlier, really big tubs sometimes have more than one scupper drain, which isn't a bad idea. I usually ask the customer, "How much water will you accept on the floor?" They get it.)
Depending on how good your tile/stone man is and how much room you want to (can) sacrifice, the new look on larger roman tubs is to have an overflow trough around the entire perimeter of the tub. You could limit it to one side but definitely not as cool.
"Somewhere a Village is Missing Twelve Idiots!" - Casey Anthony