Nice catch, there will be a lot of work to restore this, but worth every second.

Alright, I'm bringing the arcade cabinet back out for a closer inspection.
The artwork on this side has suffered, particularly at its base :



The other side is much more damaged  



...ouch... 



Let's take a closer look at the two speakers



Looking at the state of the right speaker? it does make you wonder what could have caused such damage. It might have been insects, like termites or carpenter ants, which can chew through materials. Alternatively, it could have been caused by a rodent gnawing away at it... whatever, it is dead! 



Under the back door, I can say that the cabinet is in good condition. I mean the structure is rather sturdy. 



On the other hand, all the metal parts have suffered from rust.



With so many plays on the counter, I think the game has definitely been well-utilized.



I?m removing the metal parts...10 pence arcade  coins  , evidence that it was indeed operated in England, where I went to retrieve it. 



...Other coins here and there. For my English friends here, what was the price of a DL2 game back in the day? 



Here are the rusted parts that I will be working on 



Since the arcade cabinet is outside, I'm taking the opportunity to give it a deeper clean. The colors are now much brighter and vibrant. 



You'd almost forget about the damaged artwork! 

First of all, welcome to DLF/ALS board 'saturnjaguar' 

Thank you for sharing this news.   
Well, unfortunately, I won't be able to arrange a trip to Japan on such short notice, but I would love to meet one day all those groups of Japanese enthusiasts who keep the Galaxian3 spirit alive for the public. 

Welcome back, Brian, it's great to hear from you after so many years! Like many of us here, life moves on, priorities change, but in the end... we can never completely forget our true passions. 

I see you have a Dragon's Lair Arcade 1up.  Despite what people say about it, I'd still be curious to give it a try. Unfortunately, it's not available in Europe.

Oh, and I'd be keen to see more images of your collection, particularly the cels!

Done the measurements:

The stricker was 80 width and 100 high.