*Long speech, feel free to ignore if you don't care
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I think the A1 will be too simple to need dremeling and filing. Plus since they're starting basically from scratch, and the car has a molded pan assumedly made to their specifications, they should have been able to get everything right without needing modification after. That's probably what took so long to get it ready, lots of little changes, trial and error, r&d, to make sure it's right the first time.
That and whoever is making a particular part (perhaps whatever they're waiting on) is a slacker and can't meet deadlines. I build and sell a product that is primarily molded, like a car tub is, and I know how bad mold shops can be about meeting deadlines. You tell them you need 100 units in 2 weeks, and you know that they can make 100 units in literally 5-6 hours, so they have plenty of time, but 4 weeks later you still don't have your parts. The same applies to any work that is contacted out, machined parts, molded parts, even whoever you are having print your instructions. The further away they are removed from the product, the less they care about the product. I seriously doubt all these delays are Aero's fault.
It's my experience that smaller companies are better than big ones. TTech was a great company. They designed a great car and had great customer support, best I've ever seen. Same for many other small companies, like TOP Racing and the like. But big companies like Losi, AE, Kyosho, HPI, even Tamiya,
WORST customer support I've seen in my life. Bad customer support can translate to so many other things, car quality, design, parts support, etc. If they don't even care about addressing their customers' concerns, there's a good chance they don't care about the quality of their products.
If I had the money, I'd preorder an A1 in an instant without seeing anything more than I've already seen because there's no reason for there to be anything wrong with it. My only concern would be the cost of spare arms/carriers and their availability, as long as they don't cost any more than the average and I could order 4 or so of each, I'd be perfectly happy. I've no problem building a car without a manual
Of course, given the money I'd preorder an S500 if you could yet, buy an 501x, , get a mr4bx, and any other car out there (except the b44 because it's just a chinese knockoff bj4)