The subject of mic arrays comes up quite a bit or is implied in many of the responses to questions here at RO. Here is a vid of what appears to be a custom built Decca Tree with extra attachment points. Posting this vid is not an endorsement of any mic pictured or advocating using that many microphones all the time/as a universal application. There just aren't that many good pic's for those getting into acoustic recording/concert recording of what is meant by the different coincident/near coincident arrays.
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I build mine with aluminum bar stock from Home Depot/Lowes (hard
I build mine with aluminum bar stock from Home Depot/Lowes (hardware store) and have tap and die set for 5/8-27 to mount the mic studs. Often the most expedient way to a Decca is simply three mic stands though. For your personally, you could set the rear pair up on a bar on your K&M tall stand and have a single shorter stand in front for the C channel. The actual tree apparati (? Latin was a long time ago) is best as a permanent flown install or in a studio/non audience setting. They aren't subtle visually in most cases! In the case of multiple stands the only important thing is keeping the plane of the microphones and utilizing a 1:1 ratio to the center junction of the "T". 1:1.5 (C:L or R) is also pretty common.
Here is a different custom built Decca Tree. This one is design
Here is a different custom built Decca Tree. This one is designed to be flown.