First thing is first before I get in to the moveset. This is an amazing design with the way everything laid out and how you actually drew out all the animations and such. I'mreally happy given there's not much of that for our boy on our web so thank you. I also hope you don't mind that I have the FInal Smash animation as my avi now lol.
As for the moveset, I think it's great and doesn't rely on too many gimmicks as
SPEN18
said. I just would have more units incorporated in to the moveset. i.e. Instead of Andy having all wrench attacks for his melee attacks, I would mix it up like having a Tank Side Smash for that sudden, quick knockout move Andy could have as a mix-up and even an Anti-Air Up Smash that deals heavy damage to airbound foes. Love the touch of Andy having an APC as his dash attack, maybe his dash attack could cycle from an APC to a Recon? Food for thought. My idea for an Andy Final Smash was to have either a full on Air Assault or for Andy to call in Max with a big ass Megatank and goes trigger happy on fools. Your idea is still good and all but my personal preference would be a quick and effective Final Smash seeing as so many characters on the roster have cinematic Final Smash and they kind of get repetitive lol.
If there's one major gripe I have with this concept is that Andy is missing his signature Peace Sign taunt which is sacrilege in my book lol. It's his most iconic pose from Advance Wars and all so I would not omit it. One other taunt I would have is Andy pulling out a GBA and playing Advance Wars. I think it would be a neat "breaking the 4th wall" kind of deal which i'm a sucker for.
Again, amazing concept art and moveset and it's really cool that you took the time to craft this all. I know i've said this a million times and all but I need to get my own Andy Challenger Pack concept out and all. My idea for Andy's moveset is a Fund-based system where Andy purchases units and is able to fix them (a bit different from your concept but the premise is the same). I'll def share with you once I finally get around that haha.