I don't recall seeing anything like that before, but anything is possible.
Hams in the 1950s delighted in doing "mods," and/or re-using scavenged
parts, for better or for worse :-)

I can't help with the meters and other hardware, but I do have a great .PDF
art file of all the SX-28 dials in exact scale, courtesy of Doug Moore,
which you could use to reproduce all of them if you figure out the hardware
situation.

This art is not for commercial use, so if you contact me via
http://antiqueradio.org/contact.htm , I will send it to you in personal
email. (Don't do a Reply to this message.)

Regards,

Phil