I know you're looking for a flat pack solution but if you could get a carpenter to make up the cabinets for you there are some great designs on the Seas website. I made the A26 as an experiment and was blown away by the cost/performance ratio.
I've also been meaning to make some LXminis but not got around to it yet, there are several well regarded designs on Siegfried Linkwitz's site.
I've also been meaning to make some LXminis but not got around to it yet, there are several well regarded designs on Siegfried Linkwitz's site.