I'm hoping use the Skyreach 4 Mini in a brickless build, but am having a hard time finding schematics/dimensions for the internals to use for planning the layout.
When browsing the HDPlex website, they include some really useful diagrams for some of their parts, such as the HDPLEX 400W AC-DC...
These are documents from SFF TA TWG and are rather in depth. Of note are two documents relating to 2.5" drives:
SFF-8201 (2.5" Form Factor Drive Dimensions)
SFF-8120 (1.8" Form Factor)
All of the documents can be found here with descriptions. A mirror of those documents are here.