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Maybe this should have been put under "In theory it could work"?

One of my too many builds is a Buick V6 powered Triumph GT6.
Have to replace the original rear IRS as it barely handled the original 2L/85HP.

So far my attempts at an upgrade all end up with very short A arms.

Now musing along the lines of the Ford "Twin I beam" front suspension.
Modern theory seems to like long arms, maybe try to find a way to mount each side past center as the GT6 is a very narrow car?
Buying some cheap PCV pipe to play around with.
Easy to form for experiments with a little heat.

Been done before, results?

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If I must be a one-man PC free zone, so be it!

Beneficial for a long travel suspension, what is your goal? track car? Cone killer? Swamp buggy?

You also should look at how brake torque will be transmitted so that it does not pick up the wheel or make pretzels out of your arms.

Lotus did single pivots in the center with a triangulated lower arm an upper link then something going forward (forked or not).

Spring type comes into play as well.

Maybe a De Dion?

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Honey anyone?

Mercedes IRS did a center mount for the arms below the diff. It's unique, carrying the diff on one side as unsprung weight.
Does give the lowest possible pivot point to resist jacking, and longest possible arms.

I think twin I beam will inherently bind (bend!) the drive axles- it's more than merely them moving in and out on their splines.
Correct me if I am wrong but aren't all twin I beam trucks 2wd?

Nope. Got a 4X4 F-250 sittin' in my drive with Twin I-Beam front end. Not nearly as simple and elegant as the 2WD version, but it's there!

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Mike - Read my story at http://twinlakesseven.blogspot.com/

Paved road hill-climb, barely street legal pocket supercar canyon carver.

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If I must be a one-man PC free zone, so be it!

Geometrically I don't see any problem, but how are you going to clear the differential?

Bottom of diff is level with the bottom of the frame.
Base of the A may be able to be wide enough to clear.
Trick may be getting the peak of the A to pass under the opposite side frame rail while retaining travel and ground clearance.

Trying to consider all possible options.

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If I must be a one-man PC free zone, so be it!