Just a little clarification:
The tutorial from I-hacked used pictures from when the DJR Fullbody was still a "Full-Body" Version 1, when I updated the DJR fullbody to the "V2", the slots do not gothrough all the way anymore, (like in the pictures from I-hacked.com.
The Sliver is a completely different host and will not work in the DJR, even though the 'sinks look similar in design in thier original versions (slots all the way through).
Additionally, there are two-versions of the DJR heatsink, The original-one one is a simple "donut" which replaces the reflector in the host, whereas the DJR "full-body" replaces everything inside of the head, (either the V1 with slots or the updated V2 with partial-slot). The "original" DJR heatsink, (donut-shaped) does not build the same as in the tutorial, it requires more work by the builder and provides less mass for heatsinking. There are tutorials on this forum for building with the "simple-version"
You can build a DJR-laser with either the simple "original" or "full-body" heatsink, but to build like the tutorial, you will need a "DJR full-body", (either V1 or V2), not the donut-shaped-one.
Hope this helps,
Barry