Here are some pictures of the portable digipeater box we picked up at Dayton. The bottom half or so is filled with padding, space that can be well used with batteries.

The terminals could be used.. Sure they are not powerpole but we could make adapters if necessary.

The antenna mount is nice but without some way to anchor the digibox to the ground I don't think there would be much stability. Anchor or guy it somehow..

Two big needs right now are batteries and an antenna. Since the digi will probably be high power to get out of dead spots, the battery needs to be a high Ah.