Hi Peter,
Yes you are correct. The only component not included is the mounting bracket . I couldn't really get into fabricating brackets as obviously there are many scopes fitted with many different models of focuser so trying to create a range of mounting brackets would have been tricky to say the least. I have fitted the SharpSky focuser to both my Skywatcher ED80, ED120 and my custom widefield rig.
The 'original' web-site based around using a prototype board rather than a PCB
http://www.dt-space.co.uk/SharpSky/
has several videos showing the motor, bracket and fitting onto a SW ED80. The nice thing about using the flexible aluminium coupler is that it soaks up any small errors in the bracket fabrication. The motor has to be lined up reasonably well but if there is a small misalignment the coupler prevents the motor from damaging itself or the focuser mechanics.
If you want more detail please let me know
clear skies,
Dave