I'm confused.. This is the right host/heatsink combo right? If it is..., he says that the host itself is powered by either 2 18650s or 2 18500s if you remove the extension tube. But you said that you need to get an extension tube to fit the third 18650, and also that the extension tube comes with the host.. so you are getting another host to get a second extention tube? I don't get it.
This looks so straight forward I may decide to do this as it could turn out to be a better learning experience.... Im glad this was bumped.
If I decided to copy this build..would you mind me asking some rather specific questions along the way in the future so I can get a better understanding of why you did it this way? (I learn better by applying theory ..hands on)
I could probably copy this with my limited skills. but I would not understand why (like school tests)