Hey there, new to the Mars Trek club (and pretty new to pinball too), quite a fun and addicting title! I have worked on a few EM machines, this being my most modern, so it feels like it has a lot of fun stuff going on. Neat to see how far things got at the end of the EM era.

Bought one a few weeks ago, most things seem to work as they should now. I just made a general post asking advice on cabinet repair, but figured I would join the old club too:

https://pinside.com/pinball/forum/topic/sonic-mars-trek-cabinet-repair-stabilizing#post-5148139

I didn't use the kit, mine is still mostly incandescent but did use some of their bulbs. I don't think they had the retro ones then, so what I got is kinda bright compared to the original-which actually helps in some places on the backglass (like the dark game over and ball 5 etc). I used some of their color changing and "fire" bulbs for cool effects, as posted by a Tom Malloy on Facebook's EM pinball page (you can search there and find it, although video link now seems dead). Basically slow color change bulb goes behind the woman's face in the backglass, and "fire" bulbs go behind where the rocket engines are...I added another on the playfield behind the upper left plastic with a comet on it.

I just replaced the rubber kit on it with one from Titan Pinball. Used their kit, but changed the flipper rubbers to yellow. Would note their kit is short one of the little post rubbers (presumably missed the one in the ball drain).

Wow...what a technique... Good luck with your repairs! My bonus unit was missing a coil. When starting a ball/game the bonus does start at 1,000, not zero. So, as it resets, it counts all the way down, but then does count up one before it is done...just in case that helps you.

Building a new cabinet/finding a donor is probably the way to go, but I have been keeping mine limping along. Took it to an Expo last year, but don't want to move it around thanks to the easily damaged/heavy cabinet. I added some aluminum from Home Depot that helped the aesthetics, along the bottom sides at least. It was a 8ft piece I think, cutting it exactly in half gave me what was needed for each side. Had to buy the large size they had because so much was gone on mine, I think it was like $35, but came out nice. Lots of wood glue & varathane wood hardener used too.

Stencils would be nice, but read somewhere their graphics weren't originally stenciled on, so it doesn't lend itself to that format well.

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The standard $4 lock from Pinball Resource works fine. I put one on the coin door & on the replacement I made for the backbox door. I think the original latch was still there for me to use with the new lock with the coin door, not sure if the provided latch will work...may need to fiddle around with that, but it will fit in the door just fine.

That same lock will work in Wild Wild West, lock has that shape to keep it from spinning in the hole, we have two mutual games! I have bought a bunch of those locks and have yet to find a game I haven't been able to make them work with, and nice to have a key that works for everything.

I have not sourced a back door before, have just made them with stuff I have around. I have some maybe 1/4" masonite like material, which has a white glossy finish on one side that I have been using to make doors from. Sure, it wouldn't be secure in an arcade, but it keeps the dust out, and tones down the bells as intended on older games. Cut to shape, drill a hole for the lock & good to go. My Super Score was missing the track that the back door sets in, was able to improvise with some c-channel that was intended for an adjustable shelving system.

http://www.pinballrebel.com/pinball/cards/

If you had not found what you wanted already, copies are available for download from this website. Just select "Sonic" on the left, and then click "Mars Trek" and a couple things should be downloaded. The PDF version shows up better on my computer.