Housing Floorstanders in Cabinets

Does anyone here have any experience with housing floorstanding speakers in cabinets or behind sonically transparent cloth?

I am thinking about building a theater/music room and housing the speakers in a built-in cabinet designed to hide the speakers. Are there any rules of thumb for doing this such as building the cabinets just large enough for the speakers or conversely leaving a lot of room for them? Should the speakers by surrounded by isolating foam and mounted flush with the cabinet front(soffet mounting)?

I've seen several companies like B+W who make "architectural" speakers that are not meant to be seen. How are these typically installed? Should I ask a home theater installer for ideas?

My speakers are Linn Ninkas and a Trikan center if that helps.

Thanks in advance for any ideas.