At D1 level anyone have a general template for how many RB, TE, etc you need and other specific or peculiar info necessary to make it work?

The number of players you carry on a certain position depends on the formations you run, not on the division you play. In that aspect DI ja not different from the other levels.

I thought my question was clear, although I have now read again and reconsidered.

How many offensive players do you recommend carrying at specific positions for WB? Primarily curious about TE, RB, WR

I would say at LEAST six running backs......2 tight ends ....2 wide outs and 9-10 offensive linemen. 3 qbs should be fine! good luck!

I do things a little different, but for using the WB as designed, I recommend MINIMUM:
QB: 2
RB: 8
TE: 2
WR: 2
OL: 11

NOTE 1: Assumes redshirt every year on an RB and OL
NOTE 2: Assumes mostly running with enough passing to keep the opponent honest
NOTE 3: If you go pass happy, then RS a QB also (or instead), which then means probably 3 on the roster
NOTE 4: If you go pass happy, then you probably will want another WR and TE.
NOTE 5: The more roster spots taken for offensive players...the LESS you have for defense.....you have to find the balance that works for you.