I have a small amount of experience with a stick and wire-feed,
and I am wondering about filling in the holes from my former trim pieces

will a wire-feed hobby welder w/110 ac work for this job?
I can buy the welder at a decent price but don't want to screw the original
sheet metal.
Any pointers on heat at the tip?

Without a doubt, you can fill those holes with a welder. But BE PATIENT!
I've been a welder for years and love these little portable migs. Have you ever welded b4? It can be tricky. Get comfortable with your machine before you start welding on your ride. Read the directions, because you must combine the heat setting with the wire speed setting and the gas.

You MUST get the metal clean as a whistle before you even start.
Make each spot shine. Any contanimants at all will just blow the hole bigger and bigger. These little machines are very finiky, so get yourself a thin piece of metal, scrap or whatever, and set it to the very lowest temperature you can be comfortable with.

Use quick bursts and move on to the next one. Switch between each hole on one side, because if it gets hot it will warp the whole area you are working on. Then you will have even more work.

A trick you can try. Depending on the size of the holes, you can take a weding rod, like 6010, 6011 or 7020, the same size of the hole, and strip the flux off of the rod. Stick it in the hole and spot weld the panel around the hole. Cut it into pieces so that only a little stub is sticking out. Then you can grind that down, and it won't be as tough as filling holes. That can be VERY tricky, even for an experienced welder.

Keep us posted and let us know how it works. Good luck

Hey freak,
thanks for the tips.
yea, I've welded b4, enough to know that I don't want to do it for a living!!!
LOL
as soon as I start working again, I will pick up one of the little units from HarborFreight, store located in Madison :D
I will take b4and after shots

Be careful, it has been my experience that the cheaper the welder, the harder it is to use. I have one of those cheapo FCAW welders from harbor freight, and I only use it for functional welds, meaning nothing anyone is going to see. I guess its the only option for people like me who can't afford a good welder, and don't want to pay $100 a day to rent one.

Stick with a major brand. (Miller, Lincoln, Hobart& ect.)
The tips and consumables cost less.
You can also use heet paste/jelly around each hole. This helps a lot.