Hi, I've just finished making a football cake for a friend.
I made the cake in the two halves of the ball pan, halved the halves horizontally and put a thin layer of jam and buttercream in between. I then crumb coated them seperately with crusting buttercream and pushed a dowel through to make a guide hole for later.
Then I pushed the dowel through a think cake board and hot glued it in place. I estimated the length of the dowel to be slightly shorter than the combined height of the two halves so it wouldn't poke through the top.
I chose to cover it with individual pentagons and hexagons of black and white to get a smooth layer. I put the first black pentagon on one of the halves while it was still flat on the board, and built up a layer of white hexagons round it.
Next I turned the half upside down for the bottom of the ball and slotted it onto the dowel. I smeared a thin layer of buttercream on top and placed the second half onto the dowel, pressing down gently to ensure they stuck together. i quickly evened out the join with a little more buttercream and put it into the fridge to set.
After that I just built up the pattern of fondant to complete the ball. The cake did wobble a little on the dowel, so I added a triad of short dowels through the board close to the centre to provide added stability.
I hope this helps - it's rather long!