Stu, I strongly recommend that, for a truss or strut reflector, you have a shroud in place unless you are absolutely confident that sunlight cannot come onto the primary when you move the scope so that the Sun is off axis. If enough hits the primary, it may well be concentrated to sufficient focus to burn something.
Let me search for a cautionary tale thread....
This one, if it works:-
http://www.cloudynights.com/ubbthrea...v=#Post3879491
"Another hazard for an open truss tube, with no shroud, is created when a person stands next to the telescope. I walked by the scope and received a huge blast of sunlight in one eye (fortunately it was too brief to cause damage). Even when the light is far off axis, the mirror can be a powerful solar concentrator."