Re: Battery box and socket details.
Looks like I did things the (very hard) way. When I needed to make up batteries for an old valve hearing aid (1.5V LT, 45V HT, although at least one source said 37.5V HT), I used brass rod suitably drilled and slit to make the contacts and drilled nylon blocks to make the housings. There are some photos of the process in the 'multitone hearing aid' album in my flickr account (tony_duell)
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