Looks good Kliff!
>>This hack actually is too light, and would have been better if built from heavier materials. Though not from a strength stand point, but mainly from a low speed handling point. The next rig will be 2" square, .250" wall thickness.<<
You may want to consider still using the 1/8" wall material if you plan to stick with square stock and then just plating the frame for additional weight if felt needed. That way you can still end up with a very strong assembly but will be abel to distribute the weight around as needed. Ballast if desired can be bolted to the plate to the rear or anywhere you see fit.
You had mentioned about criticism related to using all the heim ends. I may have been guilty of that one :-)
YOU are right in sdaying that if all the hookups are angled in such a way as to prevent any unwanted rotation within the heim ends you will be okay. I would ,however, make it a point to either sandwich the heims within two bracket members or at least add a large dismeter washer on th eside of the heim away from a singel bracket. I have seen the center of heim ends pull out of their socket if overstressed to the side. A large washer will at least keep the things from creating a total failure. Not my first rodeao either
Great looking outfit Kliff....keep us posted.