This has been on here for a while with no responses, so here you go...  If you can get one timber of the size that is needed in mast quality (minimal knots), then I don't see any reason why not.  I think the reason most of the mast timbers are glued is that is it is easier to get higher quality in smaller sections that larger sections.     

   Also laminated masts are usually considered to be more resistant to warping. The grains can oppose each other. 

   Thank you on yor good replay, I cut wood and laminate it how you are suggested,😀 thank you again