I have assembled a set of double bellows that I can use at multiple time period re-enactments what I learned is that BIG valves are essential. 7+ inches across.
The 1 inch pipe was a bit on the small side. I'll use a bigger pipe next time.
Based on this woodcut dating from 1580 I have a good idea of the stand style I will be using.
Civil War Bellows
There were some excellent images shared on facebook from the author of Civil War Blacksmithing
NCABANA article on Bellows contruction
Essentially you end up with a series of layers
8 door hinges
lots of screws
1 lb 3/4 inch tacks from mcmaster carr
2 sheets 3/4 inch plywood
1 piece of 1 inch pipe
ratchet strap webbing
I cut 5 identical pieces of plywood the same size as the centerboard.
4 ft long
30 14 inch wide
with 6inches wide at the head stock