When an opportunity arises to grab detailed prop images comes your way, GRAB IT!

https://originalscreenused.com/original-doctor-who-screen-used-tv-prop-dalek-tommy-gun-stunt-weapon-dr-who-bbc.php

I found an original Dalek Tommy Gun someone was selling on e-bay, not their anymore. All I could get is the thumbnails to the e-bay pics. It has a measuring tap on there. If I can find or ask around I could get some more acquit measurements for my prop build.
I just sent a message to, hopefully, mayday_props on e-bay.

I also come across the Armageddon Factor Marshal's Ray Gun, & other detailed props.
I'm go'na grab as many images I can when an opportunity like this pops up. (GEEKING OUT) 

https://ukm.propstoreauction.com/m/lot-details/index/catalog/169/lot/46866/