Powering: large welding cart for welders & plasma & torches

Hello everyone. Hope all is well, It's nice to be here.

I built a cart for my Mig, Tig, Tig-Water Cooler, Torch Set, Plasma Cutter & Shielding tanks for welders & Torches.

I built a cart for my Stick, Mig, Tig, Plasma & water cooler.
I got ahold of some old 1930's steel cartwheels. I decided to Fab up a two-story cart with a roof and side walls & tool drawers. Anyway, I was hoping to Power the cart. I have the outlets and wire needed for the cart its self. My first plan was to run at least 100 amps to a subpanel on the cart via 3 pole cord. This way I could power a welder and plasma at the same time. I was thinking of adding an additional Nema 6-50 in the case it is needed. I also wanted to have 4 Nema 5-15 outlets for tooling. So the cart would have 4 Nema 6-50 outlets and 4 NEMA 5-15 outlets.
I was thinking about attaching a 12 space 24 circuit subpanel right two the cart. However, finding a 100 + amp portable cord @ 40' is proving to be a challenge and very expensive. I also don't feel its the best plan for my goals.

I started thinking I will only be powering one of the units at one time. Max input/rush amp rating for units are as follows (Mig = 48A)
(Tig = 41A)
(WC = 1.1A)
(Plasma= 40A)
So I started to think I can put a 125A subpanel run a 60-70amp cord from the 14-50 wall outlet to the subpanel Drop 3-40 amp breakers in the subpanel and 1- 50amp breaker & 2-20amp for the 5-15outlets using them as on/off switch at the same time. making sure to only run one unit at a time.

If I'm looking at this wrong or anyone has a good idea I'm willing to listen.
My goal is to not have to run 4 + cords running from my cart. I also don't want to have to unplug one device and plug another in to change from one to the other. Running one cord from the cart to a wall outlet.
The only time I can see running more then one is if my welder or plasma is still on and I pick up a grinder and start working. However, the welder or plasma will not be drawing many amps at that time. It will be a lot easier to flip a switch then unplug and plug in every couple of min. I have pics of the cart build as it is still in progress. Framing is complete starting to find the locations for outlets now.

Looking for some advice on accomplishing my goal in this build. Also looking to make sure I'm not building a death trap. whistle I have electrical experience especially the motherboard and computer repair field. I ran 90% of the electrical in my first home and of course have a good basic understanding of electricity. I have a habit of looking at it like water. Water in water out. However, I have never tried anything like this before. I'm well awear of the fact i'm not a profesional Electrician. clap
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Possible final material list: Subject to change!

Wall outlet: Nema 14-50R 3-Pole Qty= 1

Power cord: 4/4 SOOW SO Portable Power Cord 3-pole 60 amp 2-pole 70 amp rating. QTY= 1

Subpanel: attached to the cart, 125-Amp 12-Space 24-Circuit BR Main-Lug Outdoor. removing green lugs. QTY= 1

Breakers: 40 Amp 2 in. Double Pole Qty= 3
Breakers: 50-Amp 2 in. Double Pole Qty= 1
Breakers: 20-Amp 1 in. Single Pole Qty= 2

Outlets: on Cart, Nema 6-50 Qty= 4 Nema 5-15 Qty= 4 total Qty= 8

Wire: Sub-P to Outlets: 10-AWG Stranded CU THHN Wire, run length= 2' - 3' to each outlet.

Safty Switch: On Cart, General Electric TGN3321 Safty Switch Qty= 1

Conduit: To outlets on the cart, 1/2 in. EMT Conduit
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looking for pointers and/or mistakes I made in the designing of the powering of this build. Thank you!