Today design turned poligonal with thoughts of case working floating in my head first concern was power, looking through the usual retailers i found that battery trays would increase the size and price beyond what i was comfortable with, I then looked at just the metal clips that hold batteries in place, they too are too expensive. Early this morning i was thinking and i saw a roll of very stiff wire on my desk and thought i could use that to make springs. so i quickly drafted up a case to hold a design and printed it off to test. You can see below the rigid 0.8 mm wire can fit into the groove and can be bent in usual battery clip shapes.

Here it is in person.

So from here I morphed out this design to fit in the circuit and buttons and lights. Since i'd like to have the circuit boards in my hands first before putting too much work into this, these are more of mock ups than revision ones.