Adamant,
I have taken the shallow boxes that I built the first year and added sections, that I cut off deeps to make mediums, to make all mediums boxes. The only problem that I have had is trying to insert a hive tool between the glued section instead of under it. :-D
If you are referring to wood that was commercially spliced together to make wider pieces, if it is outdoor rated, based on type of glue, I would not worry about using it.
Jim