Actual time working on them, not tons, but they've been sitting on some old t-shirts on the floor of my car since early august I believe. All the while I've been playing around with putting them in different spots, different angles and such. I actually found where I wanted 'em within a week, but mostly I've just been too lazy/busy to get started with making them permanent. Of course since they haven't been fixed, I've been able to discover cool other little nuances of aiming (none of them really worth it, however) My final setup is kind of a compromise of getting things to fit and ideal imaging. Ideally, they like to be sitting more flat on the floor pointing more upwards, but not angled back at all, which is tricky to do with the baffles I've made, and I like the design of them and prettymuch any way of aiming them like I mentioned would involve a serious intrusion into footspace. The only real issue I had with them where they're at is that my soundstage is a little low, but everything else is perfect. I've got some Image tweeters that I'll be mounting in my a pillars to raise my soundstage anyway, so I think I should be alright in the end.
At anyrate, actual construction time I'd say about 6 hours sofar, but a good bit of playing with positioning is highly recommended. I'd say atleast a week worth of just messing with them while you drive around and do whatever you do. It's amazing the amount of difference a tiny amount of moving can or can't do on occasion. I'm not entirely decided on finish yet, depending on how you do it, that's often the biggest time-consuming part of things, but with my friends and my car being the adventure-taxi that it is I'll likely just opt for durable. Rhyno-lining is at the top of my list at the moment. Also being a flat textured surface, it'll require MUCH less finish work meaning I may actualyl get it done!