I got the Blue cabinet one and a Hawaii (The other in pic is off the net to show the bat setup) from a house in Brunswick about a year ago, the owner was moving to Mornington. Sorta fits in with your post. Was there a Hawaii there? Here's a pic of it when I put it together.

I need some info on the wooden rails. Nino said they could easily be removed but mine were chiselled off. See photo. Can anyone post a close up of the rail profile or measurements or even better both?

History
I recall the following:
- Two old machines
- One backless that was shattered, but on in one piece (don't recall which game, or even if the other machine had a glass).
- One was painted Blue, as your photo.
- One had metal rails.
- One was a baseball theme.

...So it was definitely these two.  I'd imagine they were either:
- Operated at 70 Lygon St brunswick a long time ago, But that is a very small shop front. Or
- It may have came from a nearby coffeeshop that a boarder new the coffee shop.  Many of the boarders work in the near by coffee shops and restaurants.

Cafe L'Amore (76 Lygon St Brunswick) was shut down a few years ago, and got merged into neighbouring Gelobar (74 Lygon St Brunswick).  The old classic Cafe L'Amore was gutted and 'renovated'.  Gone is its rear mens private room that was larger then the main public 'front' of the coffee shop.  (I know nothing!).  Up to L'Amore closing down, you could still find old Italian men playing cards at the back, but most wouldn't know there was a room behind that out of the way door.

If the person you bought if from had an Italian accent, I wonder if he resurrected it from the closing of Cafe L'Amore.  If he was Italian looking, slim build, mid 40s, but with an Aussie accent then he was likely the owner of 70 Lygon St boarding house and he could have got the machines from his dad.  Moving to Mornington would mean he was the owner or an employe of Doc's.  The owner had many of his 'of the boat' employees living at 70 Lygon St.  Though the person showing me the machine lived at 70 Lygon, but didn't know whose machines they were.  He had the gall to try and sell them to me not knowing who's they were.  Can trust these greasball Italians!  (It's politically acceptable for me to say that).

Parts
Regarding the wood rail, PBResource sells replica woodrail for old Gotliebs.  You should be able to route off part of the underside rail if it is to narrow for your cabinet.  Have a look at the following page:

http://www.pbresource.com/siderails.html