I worked in a power plant. Same story. Engineer makes STUPID AF idea, and YOU the technician have to magically make it work.
You ask the engineer, what were you expecting this (subsystem), that (part) to do specifically? Would get an arrogant shitty reply back. Ok no help there. Step two...
Id fix the system, redesign it, E mail the entire chain, with my planned fixes, detailing the questionable competence of the person who submitted the original idea, and saying, do you want this shit to work or are we going to throw MORE millions of dollars into the toilet on stupid designs that do not work like we did with idea A, B, C in the past? (They HATE when you point out past ignorance in e mails because they can't hide from it or deflect as easily then).
Id end the letter with a 'suggestion' next time you want to design something, why don't you actually talk to a Technician FIRST, you know, the person with over 3 decades of real life experience with this stuff, AND the sorry SOB who is going to be tasked with actually making your kludge actually WORK. This will save us countless hours of back and forth, saving the company money (a plus) AND save un necessary embarrassment when all this crap has to go public because a project is not online on a target date due to poor design, and you have to mooch more money to RE design it properly this time.
Two days later, Id be called into my managers office, he'd smile at me and say, "Aaron you know what time it is" here's your counselling sheet for hurting his feelings, sign it and get back to work. We'd both laugh, and I never would have to deal with dweebster ever again. word got out after a while, if you want to 'fix' something or change it, talk to the techs who work there first.
Id bend over backwards to help a new engineer do a project, because I know the crap they are under to 'demonstrate performance' to keep their job past the probationary period, besides, it's so much easier when you both are on the same page! But when they'd come in with the, I have a degree, you don't so your inputs are not needed attitude. Ok boy, time to lance that ego you got there.
E mail is ALWAYS your friend when dealing with management who are slimy / shady / or just dirty snakes. Make sure you always BCC a copy to your home e mail as well, in case the company's servers 'accidentally' corrupt e mail files, in case something ends up in a lawsuit or something. More than once e mails saved my job from scum bag cowards in management positions.
Aaron