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dadiOH[_3_]

wrote:
First, let me thank everybody for the input on the wood type I seem
to using for this project. Probably southern yellow pine.

I have the 3 boards (~12x84x1.5)ready for glue up. I am not using
breadboard ends. My plan is to either use biscuits or some kind of
spline for greater strength and alignment. I'm not quite sure here so
any input would be appreciated.

If the board edges are true you need nothing other than glue for strength.
Biscuits or splines could help with alignment; your skill in gluing together
and flatness of boards determine the need for them. If they are not already
flat, neither will help as it is unikely you are going to be able to bend
the boards to align biscuits/splines.

Myself, I would leave them over-thick, glue up and flatten them later.

I also plan to put boards across the bottom of the top, about every 2
feet or so. Probably overkill, but I do want this to last a long
time.

If you do that, be sure to slot the screw holes in the outside boards to
accomodate movement. At the most. you would need three boards, two would be
plenty.