This is all very interesting. I'm not sure if I'm on record here as saying this, so I can't claim clairvoyance, but when I heard how company A or company B was going to get their 1st Elise and have their turbo kit whipped up in 3 or 4 weeks, I was very skeptical. I did not think it possible, because of all the fine tuning and detail work needed. I'm sure someone can come up with the component list and physically attach them in 3 weeks, but to make it work is far more complicated.
I agree with Stan, in that a lot of people (some who claim to have great knowledge) really don't know what is going on with their cars. If it runs, and gives them a big surge at 6000+, they call it great and talk about how fantastic things are. So what if it doesn't idle, leaks coolant, or pukes oil.
I am on record as having argued against the camp that thinks turbo kits for the Elise should sell for $3-4000, because look how cheaply you can buy the individual parts for. That camp never acknowledged the cost of development, testing, and detail work. Maybe the MWR Celica stuff is decent because they've sold dozens or more, and have fixed problems as they cropped up. That won't happen with the Elise. If they, or anyone else, ever sells more than 50 turbo kits for the Elise, I'll be shocked. But Elise owners expect the same quality and performance as a Celica owner, so if you want to receive that, the cost will be spread out among fewer units, and that means a higher price.
Looking at the other Hass thread, where the stuff is basically done right but lacking in detail work, I think this lends support to my contention that turbo kit prices aren't just a matter of sourcing the major components from the cheapest sources and saying "Here you go, Turbo Elise at half price." You are paying for development, testing, and details, and you can pay the vendor up front, or pay with your own time and effort.
Of course, the trick is, if you pay the $$$, that the vendor actually delivers the development you expect. Paying $$$ doesn't mean you won't still get ripped off! But it's always been caveat emptor, even if some knowledgable individuals vouch for it.