If it hasn't crossed your mind already, I'll throw in my suggestion of snapping and scoring. Although it might suffer from the same height issue. *is a newbie*
...but again, I do not trust myself to do a clean job.
The solution is to make new bases.
Embarrassingly enough, I lack the gumption to fabricate 2 more of those panels.
Wow... you guys are really exercising my "excuse-making" skills.
erm... is it working?