Build a wooden crate or use a cardboard box for Amplifier.

We are moving and I have two amplifiers that do not have boxes. My concern of course would be damaging the amps during the move. I am probably going to be storing them for a couple of months. The amplifiers are Krell KSA 200s and a KSA 300s. Does anyone have experience in building a crate that they good lend some guidance ?
I have a full wood shop and are pretty capable.
Or would I be better off with cardboard boxes reinforced.
Any Help is gladly appreciated. 
Thank You.