So basically, I know someone who can do this for me and I'm just wanting a second opinion to insure that this is all good. It's of corse a d15 and if this is possible, this would solve my wanting to get a new car and just build up this one. If anyone knows more about this than I, drop me a reply, it would be awesome!

 

What kind of information do you actually want? You can't (easily, or cheaply) put a B series transmission (GSR) on a D series motor. If this "guy you know" says he can, he either has no clue what he's talking about, he's lying to you, or he's going to be giving you a LOT of expensive parts and labor to do it.

 

Short and simple. If you don't have the funds, no. If you do, there is a kit. It's not a bolt-on affair.
It won't make you any faster.
https://honda-tech.com/forums/performance-45/mazworx-d2b-adapter-kit-%7C-d-series-w-b-series-transmission-2883097/

And, same as the last guy that asked, you have to send them your bellhousing which isn't covered in the cost of the kit.