Recessed lights and a flat roof

I had submitted my permit application, assuming I would NOT have ceiling lights. Instead I had advised a system of what I call beam lights, which is basically wall outlets placed on the walls up above the bottom of the exposed beam; they can each feed a track light or a hanging light fixture.
Since then, Mark has been suggested that we put in a lot of recessed lights.

So my question is whether it is possible - and feasible, legal, etc. - to install any kind of recessed lighting within the "sandwich'ed" ceiling/roof construction of (from bottom to top) 1.5" ceiling/roof decking (2x8 T&G), 5/8" plywood, 4-1/2" rigid foam, 1/2" denseboard, roofing membrane. I really don't know what kind of wiring can be run up there, and I know very little about LED lights.

I know that conventional recessed housings are way to tall. What I am wondering is if modern low voltage or LED lighting will allow much more shallow housing.

As far as I know, there is really nothing in the residential market that fit my requirement. But I did find some commercial product series, like PDQ lighting, Solavanti (it looks like Solavanti might be included in the offerings from PDQ), and Wiedamark.

It has been soooooo long since i last posted here

... I will try to catch up
But here are the major events, in reverse chronology:

Sept. 17, 09: Besides some hiccups on the shipping (I had to change shipping company 2 days before the container was packed), the windows got properly inserted into a 20' container - they are now waiting in Aarhus Harbor for a Japanese ship to sail them to Oakland
Aug 28, 09: The 3-4 contenders for the general contract, was gradually reduced to 2 and then 1. Mark is currently contacted to do the first round (up til window installation).
Aug 13, 09: I got my building permit
Aug 4, 09: I finalized the window order and got Simon engaged to come and help with the installation

sinks

Oh my, I regret I didn't think a bit ahead and had a sink included with the window shipment.

I know that resale value concerns speak volume for a 2-sink configuration in the master bathroom, but I think it is a bit of a fad. Perhaps for my house it would be just as important to have two full master suites - "for the mature couple with separate sleeping quarters" as the ad might say ;-)
I bet a single, spectacular, very wide sink would distract from the lack of the obligatory 2 vessel sink configuration and end up looking much more generous and stylish.

I found some really nice and inexpensive ones in my Danish catalogs, as for instance:
My favorite (don't know the brand)

Intra Wing

Now to the usual problem: how to find something equivalent on the US product market?

Here are some candidates:
1. Duravit 049112, $1022:

2. Cantrio, $1553: This one is 60" wide!

3. Neptune form Ira Woods, $675 - 50" wide:

3. good ol' Starck, $712: , a 41.25" wide sink

Unidrains translates to US English: Infinity drains

OK, it turns out I don't need to import the unidrain ;-) There is a product here called Infinity drain, First I learned that they would typically call these linear drains.
The cost of the traditional linear drain, 47" long and 2 7/8" wide, with PVC channel, will cost $704; the kit is called AG 6548.
The modern one with tile frame is TIF 6540 and it would cost $732. Here is the description: "Developed to make the drain disappear the TIF series incorporates tile or solid surface material within the grate frame. Made of 316 stainless steel frame, the TIF 65 uses a PVC channel. Grate lengths at 40". Tile insert 3/4" depth. PVC Channel length, 108" maximum."
Add to the price the tile or solid that needs be put in. I don't see any of the Corian inserts that unidrain carries.