Ah yes, if I had more height available that'd work great to have the dust commander on top..

I've found mixed posts on Henrys.. though one post in particular seems to be exactly what I had in mind.. (even hiding them under a table!)
http://www.mycncuk.com/threads/7981-...3045#post63045

That seems perfect for my needs.. and as I'm mostly aluminium, it'd work too for that would you say?