Doug.
Whilst I am unable to resolve your difficulty, I may have an understanding of the reason for it.
The 40,057 Beech-made aircraft are indeed in the database but are not accessible in their entirety, as with Cessna (161134), Piper (102386) and Boeing (33954).
However Bell (18171) is accessible and logic causes me to believe that somewhere between 33954 and 18171, the system software imposes a limit on access.
Those which are not accessible through the Browse Aircraft by Manufacture can be accessed through the Search Aircraft Model field on the front page but only the first 1,000 in the list are shown.
I must stress that this is my personal conclusion; only Ken, I believe, would be able to help further.
As you will understand, this lack of access is unhelpful from an editing standpoint. I have raised this matter with Ken in the past but have not received a response.
Malcolm.