I am making flat coils according to Tesla's patent no 512340 "Coil for Electro-Magnets".
Here is one of examples:
http://www.ebay.pl/itm/Flat-Tesla-Bi-filer-Coil-P-aska-Cewka-Tesli-/181178083005?pt=LH_DefaultDomain_212&hash=item2a2f0e26bd
Other, according to your specifications, coils can be made.
Direct email to me:
antek1cz [at] tlen [dot] pl
New direct link to the offer:
http://www.ebay.pl/itm/Flat-Tesla-Bi-filer-Coil-P-aska-Cewka-Tesli-/181187751123?
Nice coils. ;) Have you tried them?
Mags
I did, tried them for wireless energy transfer:
http://www.youtube.com/watch?v=jhRs-KtYST0
Very nice. ;) Finally somebody using them as they were intended, with the primary(transmitter) on the outer rim of the pancake and as secondary for the receiver. ;D
Mags
Corrected direct link
http://www.ebay.pl/itm/Flat-Tesla-Bi-filer-Coil-P-aska-Cewka-Tesli-/181222893165?
Antek :)