This was my plan too, until I realized I'd start at 40 and finish at like 45 or 46. Would any company/engineering firm hire a mid-life intern with no engineering experience?
I didn't know engineering firms hired developers (what for? CAD stuff, or...?) That's a great idea, though.
They like to showcase the visualisation and AI stuff but there's also a lot of development doing stuff like parametric modelling plus everyday CRUD apps for internal systems etc.