A way to make this easier, is to cut a stip of ply that matches the saw base edge to blade offset.
Then mark you cut point, lay that at the exact place you want the cut edge, and use it to guide where you clamp your guide in place. Then you remove the strip before cutting. That way there is no danger of cutting into your guide, but you still get the accuracy of a sawboard.
I've got some 400mm pineboard (aka timberboard) on a Spur knockoff (it was from Farnell, Italian but can't remember the name) for heavyweight shelving. Only been up about 6 months but fine so far.
Have you thought about starting with the various 'system' units from Ikea and similar? They might be more suitable for living room use than kitchen units. I have no experience with them, but their kitchen systems are usually well made. You could then customise them yourself.
This sort of thing:
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