So there's a nice long thread on archerytalk about homemade FrankenHeads, so I thought I'd share mine here too.
I wouldn't make them again - too much work and they didn't come up perfectly balanced, but interesting experiment. Took 100 Rage 40KEs and added the front blade from Slick Trick Razor Tricks. They weigh about 118 gr. I made three and matched them to the spine of an arrow for a low-IBO 50 lb youth bow.
You can tell I didn't even cut my arrows straight on two of those, ugh. But I just made it as a fun thing for the youth bow - I shoot fixed heads 95% of the time. I decided that if I hunt with it, I will limit myself to 20 yards period. Course, the idea is, whether the mechs open or not, the fixed blade should be enough, and if the mechs open, devastating.