MIG welders are the only thing for welding Pandas unless you have serious skill levels and very nice, clean metal. Most of us have neither!
I have tried all types of welding like tig, arc, gas etc and MIG is the best for beginners and DIY car repairs. Tig takes a long time to perfect and works best with fresh metal, arc is too brutal for thin metal like Panda's, gas requires lots of equipment like oxygen tanks etc.
Benji, have you decided 100% on the places you want the welding to be done?
I can weld some of your holes (not all) with my MIG setup and have my own materials and metal for fabricating patches.
The welding required at the front under the window is possibly beyond my skill level due to how thin the metal is, and the fact that it's on display, but I'll assess it when I see it.
Can you drive the Panda, even better leave it at my house, or will I have to come to you?
Send me a PM and we'll work out a price and time etc