Are there any regulations for welding (Mig) indoors if the power source stays outside?

Have a job in a gymnastics building that will require about a foot of mig. Its a small job and most worry will be with grinding sparks on carpet or splatter.

Have a fiberglass blanket and stands for that.

I plan on leaving the gas bottle in the trailer with the power source. Huge open building and not occupied at the time.

Maybe take my daughter for fire and spark watch. She used to workout there.
I never done a job inside and don't see a problem with it. But you never know until you ask.

Might be some off the wall OSHA regs I need to know.