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The original "Genz Box" was made out of plywood and plans were posted in a winter issue of Infisherman back in the dark ages. A jig saw, some plywood or pine boards, some nails and glue and you're done. Paint it if you feel the need. Measure the parts, battery display etc. that you need to accommodate and built it to suit. Can easily be made for under $20 even if you have to buy all the ingredients.
And I'm trying to figure out how to adapt the Vexilar puck-type transducer (used on electric trolling motors) to icefishing. (It needs to be level in the hole.)
I used a plastic ammo box. Everthing fits inside for transportation. Added an on/off switch and a light.