again thanks for all the replies...Nothing will be what everyone needs, but fortunately there are a-lot of people with these machines and a few of them think like me. Let me explain why I think a-arms are worth the while
1-tuneability -like an RC car with multiple shock mount options, you can quickly adjust spring rate or up/down travel ratios, you would also be able to adjust your camber/caster
2-geometry-as you hit a rock with your carbide at a low speed and it grabs, the suspension compresses; thus pushing the ski forward into the object and buckling your trailing arm. on an a-armed sled the geometry is rearward during compression yielding to the object. A-arms also act more like a snowboard/skiis when carving while the trailing arms are fighting the action by creating a longer inside contact surface.
3-strength. Having gone thru several pairs of trailing arms I already bought an a-arm kit at 1K. A-arms are stronger.
4-serviceability, a-arm components are easier to remove/replace than stock edge suspension. I would not use bushings, I would use heims all around for tuning.
5-weight yes there could be up to a 5 lb gain in weight max.
Like stated before I have no idea if using the stock bulkhead is even a good idea. I'm considering a full tube-chassis that just recycles all the edge-rmk parts allowing the consumer to put together any number of setup combinations to either build a sicky-custom or recycle a bent machine...