To summarize OP's post
Every single gun is free to make(no real money). When I first started all I saw where guns behind plat too.
It is intimidating... I get it.
HOWEVER...
Over time as I increased my MR level... I started to see the blueprints unlock and sold for credits. I started to have weapons made faster than I could level them.
English
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It seems pay to play as some of the stuff that drops early have material that seems impossible to get. It's only when look at other planets you realize that you need to get to them to have more access to this material. Another reason is it seems like I'd never have that many things in my build kiosk. Now I have too much stuff. Many need more Items to be built but I have a lot of things to grind for.
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And frames can be earned through bosses and quests