There was 14 Sirius's built with wooden fuselages, 4 converted to Altairs, 1 Sirius DL (metal fuselage) was built and later also converted to an Altair.IMHO I think the Sirius that General Fierro of Mexico was the sharpest. It wasen't insulted by the closed cockpit...which was Anne Lindbergh's idea.

As Monocoupe pointed out you need to find a copy of Revolution In The Sky, it will help a great deal. The Wylam drawings while very nice are for someone that dosen't know better. I'm not criticizing anyone for following them, they are the closest thing most of us have to ANY information about these wonderful machines. For the most part they are pretty accurate.

Some incite into my wooden Lockheed background, I've researched these machines for about 13 years now and am in a partnership with a gentleman that has been researching them since 1972. We traveled to Switzerland last year to study the sole remaining Lockheed Orion, it was the Shell Lightning that Jimmy Doolittle flew, incidentally it was a converted Altair.

Between the two of us we possess the most complete original factory drawing set that is known on the wooden machines. Were
also building a 1:1 Lockheed Altair, of which I have the wood for the wing spars in the shop now and should start building within the month. I am also looking into doing plans in 1/4 and 1/3 scale
for at least the Air Express, Sirius, Altair, and Orion. I've never been a huge fan of the Vega.

If I can be of any help to you on this project all you need to do is ask. I may even have an extra copy of Relolution In The Sky, I found 9 copies in a book store marked way down and bought them all. I've given several away and not sure how many I have left.

Al