> http://www.3dcontentcentral.com/parts/browse/Computers/User-Library/88/88/Models/download-part.aspx?id=1639
The forum server software, I guess, is inserting spaces in the link making
it unusable without cleanup.
>
There is one extraneous part in the sub assy that may be causing your
merge attempt to fail but merging multiple bodies with slightly complex
surfaces can always be a tricky proposition. I would, barring a good
reason not to, simply use it as an assembly. If I had a need to make a
single part from that I would copy necessary exterior surface and fill
in the blanks to enclose a volume (probably omitting some of the finer,
such as fillets, details). A 'shrink wrap' function may give a good
'starter' surface set.