Alternative to 1/8" Baltic Birch?

Thin structural plywood is common place in home built aircraft, WWII aircraft, and radio control boat/aircraft hobby.

Search your favorite site for ‘aircraft plywood’ and 1/16-1/4 is easy to find.
There are even companies that make custom laminate short run panels for folks making replica aircraft.

Have used Aircraft Spruce & Specialty in past for 5×10 wing skin plywood, but there are many other suppliers. If you live in area with several small air fields, have a WWII plane club, or a home built aircraft club in area; occasionally will find the a commercial lumber yard nearby carries some of the MIL spec grades of aircraft plywood for community. All you can do is call every one and anyone advertising plywood in your area.

Lumber sourcing varies greatly by regional area. If your profile included you city, state; might have some one close share local sources?

Best Luck.

-- If it wasn't for bad luck, I wouldn't have no luck at all, - Albert King - Born Under a Bad Sign released 1967

Both the Rockler, and WoodCraft stores near me stock it. But it is 5×5’ or smaller panels. If I were looking for it, I would start asking my local suppliers of BB ply if they can’t order it in for me. Going based on that I am happy with the product they are currently selling me, over just buying online from someone I had never dealt with.

-- Think safe, be safe

The outfit that put in our Quartz used 1/8” strips to make a template. I contacted them and bout 3 sheets of 1/8” plywood from them. It’s sitting the back of my garage behind my boat waiting to be used for something.

You might contact countertop shops in your area for something similar. This stuff is obviously some sort of mahogany.

The outfit that put in our Quartz used 1/8” strips to make a template. I contacted them and bout 3 sheets of 1/8” plywood from them. It s sitting the back of my garage behind my boat waiting to be used for something.

You might contact countertop shops in your area for something similar. This stuff is obviously some sort of mahogany.

- BurlyBob

Probably Okume plywood, most commonly sold as marine grade plywood due light weight and easy to bend: https://forestplywood.com/blog/plywood-uses/what-is-okoume-plywood-and-how-can-i-use-it/

Could be Luan skin plywood, but tends to be heavier and high ply count does not bend as easy as Okume.

There are enough different types of plywood available, it will make you head spin.

Cheers!

-- If it wasn't for bad luck, I wouldn't have no luck at all, - Albert King - Born Under a Bad Sign released 1967