If you download the pics from the website mentioned above they are well worth studying for ideas.
Dont forget you have to make a way of keeping the bees in the hive when you disconnect the entrance tube AND stop those already in the entrance tube from leaving the tube and flying around the house. They panic and mess on the curtains, which gets a slap around the ear.
I made a metal plate that slides in runners and is operated by a piece of welding rod leading to the end of the frame and thro a hole to the outside, which is moved backwards/forwards over the entrance hole. A slot in the front of the frame into which you can slide a bit of metal will work the same, probably better, because the bees wont have any nice things to glue together!!!!!
This photo shows basically how the frame rotates. Fitted into the top of the joint with the red X is another short piece of plastic pipe which the hive sits on by use of a hole thro the bottom where it is marked in green.
The red x joint is clamped (held) in place by the two main supports by cutting slots/groves/sawcuts/ bits hacked out with chisel whatever. The bottom runner is to keep the two main supports together. I have loosened things up a bit just for the photo.
I had to do a bit of photoshopping there to show things better. The white is part of a pice of card I put under hive to catch rubbish that they chuck out thro the mesh floor.