I'm starting to think that possibly there was no original cabinet and that it was only sold as an upgrade kit... is there anyway to confirm this?
A quick check of the usual arcade manual sites only shows the conversion kit manual.
VAPS lists 13 users who have either the board or conversion kit -- only 2 of 15 entries are labeled "original/dedicated" cabs and one of
those says in the comments that it isn't in the original cab.
Related thread
here on KLOV.
The evidence seems to point toward either:
1.) Conversion kit only
or2.) Generic cab (Dynamo, etc.) rather than a unique style/shape.
Scott