So why use shims? When building the rack, couldnt ya just make the bins tighter to the top frames? Just a thought! I havent built one yet but am getting ready to this weekend!
some rodents tend to chew...its as simple as that.
I'll have to take a pic and post it, but my male has put windows in his hide! He can lay down with out being seen but if he hears someone in the garage he pops up and looks out his window!! LOL