Welcome!
As far as DIY speakers.
www.gr-research.com has several kits that are Superb! I own the AV2's and AV1RS designs. They are complete kits and you can build the enclosure yourself or order the enclosure from them. I personally build all my own enclosures. The AV2's are extremely good especially for their price. If you are building in-wall speakers or speakers that must be close to a wall they have a variation of the AV2 called the AV-3S, it has adjusted baffle step loss for these situations.
I have no affiliation with GR-Research, just love the products and Danny's service. The AV1RS surrounds are unreal, they really improve soundstage. I have some pics on my site but not much as of yet.
Darren