Like most components of the Langstroth 10 frame bee hive, the telescoping cover is fairly simple to make on your own.

The materials I used to make mine are as follows:
(I don't have drafting software to make nice exploded schematics)

(2 pieces) 20 1/8  x 1 X 2 1/4 pine
(2 pieces) 18 1/8 x 1 x 2 1/4 pine
(2 pieces) 7 1/4 x 1 x 17 pine
(1 piece) 5 1/2 x 1 x 17 pine
(1 sheet) 23 3/4 x 20 1/4 galvanized sheet metal

Before starting we took both 20 1/8  length pieces of pine and using a dado blade, cut out a notch 3/4 inch deep. You can see it in the picture below.

It's to hold the 7 1/4" and  5 1/2" length planks. (Alternatively, you could use plywood instead of planks).


Once the wood is all cut to size, we glued and nailed the frame together. Thanks to my dad for letting me use his air nailer...those things rock!




Once the frame is together, I put the three planks in the track and nailed them to the frame.

Again, you can use a sheet of plywood...we just happen to have extra planks laying around.









Once the frame is built, we test fit the cover on the hive bodies to ensure it fits.



To help protect the cover from the rain, sun and other elements, we bought some galvanized sheet metal and shaped the corners and edges so that it would cover the top and down 1 inch on all sides.



Then we drilled the hole sides of the sheet metal, and used nails to tack it to the wood frame.



Once all the nails were in place it made a very nice, tight metal cover, and the  telescoping covers were complete!