Lian Li posted pictures of an unreleased prototype case, which it named PC-A51. Design of the new all-aluminium, wide-body ATX mid-tower case is not finalized, and the company is seeking feedback from the PC enthusiast community (you can leave your comments with us). The PC-A51, in its current iteration, starts off signature Lian Li style - a black aluminium monolith, but tries out something unusual with its clear acrylic window, and metallic red interiors. The motherboard tray, along with portions of the drive cages, and the rear panel, feature a contrasting of black and red. The case features a front-oriented PSU bay. The case has room for add-on cards as long as 28 cm, PSUs as long as 16 cm, and CPU coolers as tall as 17.5 cm.

The motherboard tray on the PC-A51 prototype can seat boards in common ATX, micro-ATX, and mini-ITX form-factors; along with the internal drive bay, it's largely tool-free. There's room for five 3.5-inch drives (each tray can stack up to two 2.5-inch drives), and a 5.25-inch drives. Ventilation includes a 140 mm front-intake, two 140 mm top exhausts (which can hold on to radiators as big as 140 x 280 mm); and a 140 mm rear exhaust. The back side of the motherboard tray has clearance of up to 2 cm, which can let you handle your cable spaghetti better. Front-panel connectivity include four USB 3.0 ports (standard header), an eSATA port, and HD audio jacks.