I know this is a PCE forum but I also install Hi-Def NES kits and N64 UltraHDMI kits, I can also do RGB mods or bypass on most consoles.
If you are interested in Hi-Def NES kit install, I charge $85 plus shipping. I will also replace all applicable capacitors and if you wish I can swap or install power leds. If you are unfamiliar with this modding, it involves installing interposed that intercept the CPU and PPU signal and outputs a digital 1080p signal over HDMI. If you order a kit from Game-Tech.us you can have it shipped directly to me and save on shipping cost.
For the N64 UltraHDMI install, I have kits on order currently. For kit with install I charge $230 including return shipping to CONUS and will also swap the power led if you wish. This kit is similar to the NES kit but intercepts a digital signal directly at the N64 Reality Co-Processor. I am an authorized installer for the UltraHDMI.
If you have any questions my contact info is in my signature. You can see pictures of some of my work on my twitter or Facebook page.