TH9 Farming Base

I am just finishing of my TH8 upgrade and planning on using the plan below,

http://clashofclansbuilder.com/plan/683587

Anyone have any changes they would recommend I make to this plan?

My main concern is would the hog ring work on the corners with the x-bows?

Cheers

Switch 2 of the ADs and the drills, probably the ones near the crossbows, and then switch the WT and DE drill. Do the same with the hero altars and put them to sleep.