Don't know too much about conversion details, as I don't follow that part of the industry, with a magnifying-glass.
In 2005 Bedek did not have an STC for Boeing conversions.
Saw some quotes from the Company, stating that they consider themselves an OEM, so STC ? maybe / maybe not?
Also had heard that the BDSF conversions cost less than BCF.
General differences between BCF and BDSF conversions:
BDSF have single window between doors 1L and 2L.
BCFs > all lower deck windows plugged except in the doors.
BDSF > all windows plugged behind upper deck door.
BCF > single window behind the door left.
...probably some exceptions flying out there...
Bedek conversions on World Airways, Air China, Eva Air and Asiana 747-400 frames.
I don't have any notes 0n 767 frame conversions.
Anybody with any additional info, or corrections to my post, welcome!
John