Topic "Install solid tread and risers with molding?" a message from Delta5

Hi - I searched around the site and haven't found what I am looking for. I'm a handy guy, I've got a few thousand feet of wood under my belt, plus plenty of other projects at the house. I paid someone to install teragren in my home, and currently I'm looking up information to help me resolve an issue I have with the work.
My issue is a very costly installation of Teragren solid risers and treads for a stair case (as part of a whole house job). The risers were not fit to the bottom of the tread, and the gap was covered with stained oak. Ugly, and it doesn't look professional. I believe I could have done better.

I'm looking for documentation from NWFA or anywhere else that shows good practice of how to install risers / treads. I've already contacted Teragren, and I am waiting on their guidance as well.
[font=arial, sans-serif]
[/font]
[font=arial, sans-serif]Two ways I would consider are: (1) fit the riser side to side, and scribe the top to account for any unevenness in the top; (2) run a kerf through the bottom of the tread for the riser to slot into.[/font]
[font=arial, sans-serif]
[/font]
[font=arial, sans-serif]What is good practice here, and is there any documentation describing it.[/font]
[font=arial, sans-serif]Thanks guys. I find many of the pics of work on here inspirational.[/font]