Ok so I made up a test piece using the 450mm centers and it works fine, it takes 180mm horizontal travel to get it to reach 800mm high which is all I think it needs to be. My only concern is that at that height it may be too narrow and then be a bit unstable.Using 40mm wide strips I can only get it to fold down to 200mm high but I don't see that as an issue because you can lift the front wheels up onto it and then lift the rear wheels on by lifting the handle. I think I will make up one with 600mm centers and see what that looks like.