How badly could you screw up a pre-existing design?
If you're worried about mismatched corners, you can always power sand them down, and then apply edge roundovers too.
If you're worried about gaps, you can fill them with wood filler before finishing.
If you're worried about finishing, you can always use wood IE baltic Birch, instead of MDF and just stain it.
If you're worried about bracing, don't be. You know deep down that you'll way overbrace before you underbrace.
If you're worried about making the wrong cuts, don't be - that's what good tools are for!!
Doooo ittttttttttt