joining legs to a nested torsion box in an outdoor table...

Hey all.

This seems like it should be so much more simple than I am making it. So perhaps you pros could lend an ear and point out the obvious to a novice? I would be very grateful for anything you can offer.
So, please bear with me. I am going to try and make this as short as I can and semi-intelligent.

I am in the last 30% or so of a build on a Parson's style, rustic farmhouse table intended for the outdoors in Los Angeles.
The kicker is, the table is 14'x33"x29". Add to that: two nesting ~11ft benches and i have myself a quite unwieldy job for a single set of hands. But I have managed so far.

here is the general plan in sketchup:
original size: http://ift.tt/1GKDzYq

I am using cypress, in the rough, from a local lumber yard out here. It will be weathered with vinegar/steel wool then given a latex paintwash.

On to the confusing bits:

In order to reduce sagging overtime and deflection from big dinners and elbows, I built a 12ft torsion box that will be nested up under the table top and enclosed somehow behind the apron and between the legs. The torsion box dimensions are as follows:

12ft long
21in wide
4.5in deep

constructed of 1/2in mdf skins and webbing and 3/4inch mdf sidewalls. it weighs somewhere in the neighborhood of 100-120lbs.

standing up on edge just for the pic's sake

I thought I could notch out a section of each leg to accept each of the 4 corners of the torsion box, then use 2 hangar bolts and some reinforcing hardwood (to be secured inside the torsion box on each corner) to secure the legs directly. BUT, because I plan on using haunched M/T to attach the apron members to the legs, I start to run into issues of clearance and usable meat to drive in the bolts. (The legs are 3.75x4.75, laminated cypress)

here is my attempt to visualize how that might work in sketchup:
orginal sizes:http://ift.tt/1GKDzYu

all angles are from above the leg/apron

you may be scratching your head at the small tenon with stub dowels. That is because I came up with a setup that I think is probably overcomplicated and begging for disaster since the measurements/clearances dont have enough play to allow for mistakes.

here is a grab of the torsion box (represented by just a corner segment showing the inside hardwood pieces and bolts.
each bolt would clear the tenons and hanches/stub dowels by 1/4 in or less... which makes me really hesitant to call this idea a success.

original size:
http://ift.tt/1GKDzYy

SO.... I feel like I am painting myself into a disastrous corner and I am hoping that there is some very simple solution to all of this. Perhaps I can find some sort of hardware that wont be too obvious and stick out too much to attach directly to the legs without removing material from the stock? Maybe I can notch out the legs but not fasten the torsion box to them, instead allow it to "float" within the confines of the apron (assuming I build some sort of cage or shelf to hold it in place on the apron members. Maybe I can change the orientation of those hangar bolts, or use a single one either vertically into and along the length of the leg ... or counterbored diagonally into the leg member?

On top of all that, once I nest in the torsion box, how will i be able to attach the table top to the apron effectively? the torsion box will be in the way. I suppose I could fasten the long rails with pocketscrews on the inside, drop in the torsion box, attach the legs to the box and apron, then finish the short apron members with pocket screws on the outside... but that feels sloppy.

I have no clue if any of this makes sense. It confuses the hell out of me, so feel free to ask for clarification... if you made it this far, that is.

Thank you all very much for any and all help you can offer. I really appreciate it! and again, im sorry for the length and confusing description.

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joining legs to a nested torsion box in an outdoor table...