A decorator
Willing to pay plat for somebody to decorate rooms in my dojo

Will ask for proof of builds
Will ask for pictures

Looking for somebody skilled at building

Hi, I'm not sure what you want. But if you're looking for an architect to build a dragon around your dojo, or gigantic figures inside, then you'll have to expect to spend several thousand platinum or several thousand gold coins. Back then, I had to pay around 5k platinum just for the materials for my architect. Think carefully about whether you want to hire someone for that. If you're prepared to invest several thousand platinum or gold coins, then I recommend asking in the Warframe forums yourself. There are thousands of architects there. Make sure you see what they've actually done first. There are plenty of people there who can't do anything but talk a big game. I hope I could help you a little.

I have no problem paying platinum for it at all

If you have a lot of platinum, I recommend searching the Warframe forum. There are thousands of people offering that kind of thing there. You're guaranteed to find what you're looking for. I think you're more likely to find it there than here. I could try contacting the guy who did my dojo back then. But it's been seven years since I last spoke to him. So I'm not making any promises. But like I said, I found what I was looking for on the Warframe forum back then.