Right and the reason I ask is because you are not going to find the cheaper aluminum frames (some would say any aluminum frames) to have anywhere near the same durability as steel.
Personally, I would steer clear of the Micargi. A quick search will bring up a bunch of cracked frames and bad welds. You probably don't want to hear this but the Schwinn cruisers are not much better but after looking at the work you did on that stretch I think you are just not going to be pleased with what you find.
The imported bikes from Asia break down into those from Taiwan and mainland China. There are three bike factories in Taiwan and they produce better frames, under many different badges more towards the mid to low-high price range of many so-called American companies. The stuff from mainland China, like Micargi, are made to a price point and most definitely are inferior.
Looks like you are just about ready and able to be making up your own proprietary frames anyway. Good luck.
BTW, I didn't look if you had posted pics of the stretch in the photo gallery yet but it certainly deserves to be there, nice work.