I'm getting ready to join some irregular sized blocks. They're all pretty close, but some are .25 to .5" larger or smaller that the 12.5 they need to be. Trimming them down will cut off points, so I'd prefer not to do that. And I don't think pressing to "stretch" them will work on the smaller ones. Do you think it would work to put sashing around them and adjust to a uniform size that way?