I'd suggest you don't need a full 2.4m long bench for piecing your work together, so cut them all in half. now you've got 30. I also don't think you'll want a narrow bench like most make or a heavy top, unless you are planning on more than layup work and the occasional bit of other woodwork. with that in mind.
14 glued on the short side will give you around a metre depth at 1.2m wide, close enough to a square to be considered a useful layup table (which is really what you want, especially for a lifesize eagle). you've got a choice here, through tenons or screwed legs, for me I'd go through tenons because you can make them easily while you are glueing the top (you can get clever if you want and make wedged tenons by cutting a angle on the hole sides, but you don't really need that). simply cut the second piece from the edge before you glue it leaving a mortise once it's all glued up, do this at each corner and leave a nice overhang, about 100mm should work. great, now you've made the top lets make some legs. 3 pieces glued together will do nicely and be rather sturdy. again you've got a chance of an easy mortise by cutting it before you glue, be silly not too. that leaves you with 6 peices left to make stretchers and rails, front and back, both sides about 100mm from the bottom of the legs for the front and back, just above that with the sides. if you've gone with mortice and tenon you'll need to cut those on top of the legs, they don't need to be fancy and can be done with any saw you've got to hand. same with the rails. glue it all together, flip it over and call it a bench. then spend an age with a scrub plane, jack plane and scraper to get a perfect flat top, or chuck a piece of MDF on it and call it done.
something like this, only short and square rather than long and thin.