I couldnt find the H81 BTC, but I was able to buy one of these new Biostar BTC motherboards that use the B250 chipset (Kabylake + Skylake CPUS, DDR4)  - Got it from NewEgg (now it seems to be out of stock I guess) https://www.newegg.com/Product/Product.aspx?Item=N82E16813138449&cm_re=Biostar_BTC-_-13-138-449-_-Product


I've built a frame with wood, and plant to start with a 3 GPU rig, and move up to 6 GPUs in  a month.

https://lh3.googleusercontent.com/bbHoEb5MKy_lcjyrwWKelf3yGIYT3atQsmybAzk2DxM7mzyd_-_4r7IWdCq7Xugq9JJupBKe1LKYPR680yJPbymnsgqYg729k_rYJbRG41rY8dZKmiS4ZvCjyifFetpRtzE3LcjZ0kjC8357W9qhOGL4vrGoOByf23-35o9rS9iiKawMwnwYMU9KykFSb78Wqxcx_3BxQB9Xqs7jWtSwpN6f6Ab2V7AUM5stMD7C8PcHdDw1DacMaccncEpY4g41YF-QedQOZ3evfZyow2vh6ZZjenqcFHICxfrwVcmPv49Fyq4gw08AEU5S7dR0_ddm5fbyK2kOpTNKvrpqutwOlPMW9hlZLp24lSDii6F9mNDttpXo0Ra7vjoxzHW064Gvkmnx40LUQcP2_B01wwXgNHoQlRQQC1Rt3mVFHUfoSwek1PY6wBlCT5L9Q_rUCn_hJJuu14NmzLVxLkpha5BVjYn-Q6yB0FShxVXe_YbTB_sXWz94OoWkomQqGKlT0gIza7xT9Uv1aAXWEG7-W0Z9ZbNgQyJCwc1WlrjpX8_X6Ni7ltyw2ygxJPzLb-X7CyDJ7IsyBKEwRjvWOX7DYYVJmlTKSR3R-Rf0Eh_bG8J2yoYdO26yCRqPyg=w1234-h925-no

Regards,
Vish