Hi, did mine ages ago all i can remember is that the top rails go directly above/inline with the bottom rails. so all the tunnel sides remain at 90 degrees to the floor
I worked from the back forwards the rear section is parallel then tapers out.
there may be an error on the hoop bits as i recall cutting another cross tube but it might have been just me.there may be pics in my albums I cant remember.
put up some pics so we can see the problem
Ray
