Probably the best way around the tabs (and avoiding the fitting problems you mention) is to take a small strip of paper (I use the scrap pieces left over from earlier cuts), score it (so that it bends to fit the joint) and glue it to the INSIDE or BACK of the joint (where it won't show).

You save yourself some time drawing, actually make the joint stronger, and can make the "tab" as large or as small as you need without screwing up the seams.

I found that using painters tape, which can be removed easily, can hold edges together.  Use a toothpick to put glue on an edge first then remove tape when dry. 

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