Metric plans?

[Sundog]

Hey Jim

My comment was based on the plan link I provided that shows 3/8 inch rails.  I have never purchased a bottom board. I too made mine with a 3/4 inch bottom rail.  Made my first one with a dado like the plans and the water got in and it failed along those edges first.  After that I stacked layers.

[BeeMaster2]

Good photo Sundog.
When I started making the bottom boards, the inside looked like yours. I then found that the SHB and mites were landing on that edge instead of falling through. I try to make the ledge (which is for attaching the #8 wire) as small as possible. 
Jim

[Sundog]

...I try to make the ledge (which is for attaching the #8 wire) as small as possible. 

Good point, Jim.

[TassieBee]

https://www.southerntasbeekeepers.org.au/_files/ugd/313a30_2966bc78bcd94d62823b969ebdc2bfca.pdf

:-)

[BeeMaster2]

Tasssie,
Welcome to Beemaster.
That is a very nice set of bee equipment design drawings in metric.
Thanks for sharing it.
Jim Altmiller

[The15thMember]

Welcome to Beemaster, TassieBee! 

[Ben Framed]

Welcome TassieBee