Seldom see this chassis on eBay, but considering the cost of the similar 846 chassis (with decent backplane) and motherboard separately, I think it's at least a reasonable deal, albeit a bit niche. E5-4650Ls aren't too pricey at least if you're going to use it. Apparently the PDU has GPU outputs as well.
Supermicro 4U 848A-R1K62B / X9QRI-F+ / Barebone Server / 24x Trays / Rails | eBay
Supermicro 4U 848A-R1K62B / X9QRI-F+ / Barebone Server / 24x Trays / Rails | eBay