Moving down the case you get your standard case layout. A rear 120mm exhaust fan next to the I/O area and then all the PCI expansion slots. Moving towards the bottom of the case, the other location for the PSU is located. A bracket that the PSU would be mounted to is held in place to the case via four thumbs screws. To swap positions with the top of the case, you simply have to remove this bracket and replace it with the grill from the top of the case.
Case Inside
The true beauty of this case shows once you open it up. The amount of space in it is amazing. There's enough room to fit 10 hard drives (good for those RAID fanatics), though we do have to take into mind it is a server style case, also known as E-ATX. Basically the case has another level on it; If you took the bottom HDD cage off and space for the bottom mounted PSU, you'd have a regular sized case.
Up in the top of the case, there are the standard five 5.25" bays and a PSU mounting area. The only real difference is that there's a 3.5" cage mounted where the PSU can go if the user decides to mount the PSU in the bottom of the case. The PC-A70 also has a removable motherboard tray like most of Lian Li's cases.
On the backside of the HDD cage, you can see the two front mounted 120mm fans as well as another two directly on the cage. There also is a bracket that runs from the top of the case down to the bottom; It is for support of large graphics cards. For extra support again, there are a series of slots attached to the HDD cage that the ends of over sized GFX cards can slid into.