Yes, the tolerance is pretty tight for it to work well, but a quick router jig will get it done. You may want to insert them prior to skinning so that you can use machine screws and bolts to hold them in place, rather than wood screws, as I've had a couple catch as they were separating and stripped out a couple screws. With your system I'd think a pair at the top would pull things together, since your base will do the job at the bottom.