OMG I have spent TOO LONG making this, I had to open four armour generators and make the pieces, then copy and paste the command on here, it took me, like, an hour! I hope this command works this time, because last one I made (the Unusual Villager) had a few trades that didn't work.
This is my first sign command, so if this doesn't work, I'll try fixing it. if unsuccessful, I'm sorry, I'm not really good with these things and I do try the best I can. Enjoy!