Bluestar - I asked TTB some similar questions about a month ago and below are their responses. I didn't ask you final question directly but from part of my phone conversation with them we can have a designated space that serves as an alternating premise. For example you could have a bottling room that serves both the DSP as well as the winery. So as I interpreted it, part of the DSP could be an alternating premise in which the winery products could pass. Hope that helps a little.
What kind of separation is required between the winery and distillery?
The separation must be floor to ceiling with no passable access between the two operations
Does it need to be a wall and completely separated space with separate entrances?
Yes, unless the main entrance is into a common general area with separate access from that area into each operations that is lockable from the operations side.
If we were to ferment wine and later distill it, would that have to be transferred to the DSP with the appropriate forms similar to wine transfers between separate entities?
Wine can be transferred from the winery to the distillery, wineries for not have to submit transfer in bond paperwork, but both the winery and the distillery will need to notate their daily records of these transfers.
Are we able to operate under the same entity?
Yes, a single entity can hold multiple permits (both type and location).
Is there anything else unusual beyond the regular winery permit requirements?
There is nothing unusual about this type of winery application, unless both the DSP and the winery will be sharing the same space and the same equipment. In that case the original winery application would show that they are an alternating proprietor with the DSP as the host and them as the tenant. If this is the case the DSP will also need to amend their permit for the change to an alternating proprietor with the winery.