Ed,
Checked out your website. Very nice.
It would be quite an accomplishment to round up one each of all of the Allyn and Patushin ashtrays. Seems doable. But add in Riffe, Buehler, Raise Up, osgaard and................ Things can get out of control. But as I always say, "Anything worth doing is worth overdoing."
The ashtray thing becomes even more complicated when you find that Allyn issued their models on ashtray and regular stands. Is an Allyn on a plain stand still an ashtray model? You can't pass up a nice Allyn just because it's not on an ashtray base. Next you find that Allyn's moulds pop up in the hands of Pacmin. Is it still an Allyn? You can't pass up a nice example of an Allyn just because it was issued by Pacmin. Now you have an ever expanding galaxy of models to collect from. I love it.
Below is a shot of military Allyns and a couple of other makers. While they are not all ashtrays the Allyns were available both ways. They ended up together because they were all shiny chrome except for the Verkuyl Thud.

There are two B-52's in the above case. One is the most common one representing an early model Buff up to the D-Model. There is also a less common late H-Model which is distinguished by its short tail, slightly different wing and early fan-jet engines. So if you have only one Buff you can't stop there!
I would not even want to guess how many different ashtray models were produced by Raise Up. I have a Viscount, DC-7 and a Connie. When you multiply that times the number of different liveries they did large scale models in the possibilities are staggering. Below is my Raise Up Capital Viscount.

Back to your original post. Yes, I too am seeking a Boeing 307. It would look nice right here

Cheers,
Ladd