I'm only a commander 2 right now and have a 1500 crafting rating. It's not hard to do if you start doing it from the beginning. My ship and crew are full of Mk 6 blue and purple and all I had to do with click on anomalies while doing the various klingon missions. It's incredibly easy to do. STO has some of the easiest crafting I've ever seen.
It's a bit obnoxious but it really isn't that hard to grind crafting as opposed to repeating that mission over and over. Plus, in the end, you have high level crafting for the next half baked item release, lol.
There's a difference though. With my Fed characters I need only one crafter. If I wanted more Pengs on Klingon side I'd have to level up crafting for all of them.