Hi DAL900,
I'm currently building an A340 TQ to custom order and can build any type really time permitting, Aerosim Solutions is not full time for me, (yet?)
I accept a few custom orders because others have asked the same question as you do. If there is a need for something unavailable I will sometimes put my hand up as a supplier. At the same time as building a prototype a lot of effort is going into future production processes and this takes a lot of time so I have quite a backlog of TQs to make at the moment. The other Boeing quads would be easy enough to replicate and I'm also planning a generic Lear type quad at some stage.
Regards,
Gwyn