Scarebird Rear Conversion

Since I was working on my rear I was thinking of converting mine to disk. Has anyone here converted their 8 3/4 from drum to disk using the Scarebird Adapters? I know Outlaw converted his from brakes to disk using their adapter and it seems to work well. I have a set up form a 73 Duster to convert the front. I'm also going to changing the bolt pattern from 4" - 4.5".

Looking for a cheaper route than spending the money on a rear disk brake conversion kit.