It took a TON of trades on here to get the rusted parts, but I think it was worth it! I make it a point to craft every DIY I ever receive, too, so I had to get it done.
Through a ton of tting and hitting my rocks daily as well as on nook miles islands, I've managed to build the robot hero. I really like it and it goes on display next to one of my houses.
I think I want to get it purely for the satisfaction of making it cheat-free! Sure it takes a lot of rusted parts (that are hard to come by), but even if you’re not trying, you could still end up getting it (although it would take a lot longer). I think it’s worth it! It’s just that I’m not sure it would fit my island aesthetic... although I want to make a cute area with the Statue of Liberty/other large statues, so maybe it could fit there?
I'm hopeful they add more items to craft from the rusted parts. I feel obligated to keep them because they're so scarce, but don't think I'd ever build the robot hero.