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You may find, as I have done, that under load the stated voltage drops quite a bit. I made one up a few years ago as a Lab supply and it was great except it was always a half volt or so below stated voltage on the 12 volt line. This is due to the 10 ohm, 15 watt on the +5 volt line which acts as a dummy load so the supply will switch on. It was ok till I used it to run my EQ6 where the 12 volt dropped to 10.6 volts. Funnily enough the EQ6 didn't mind the lower voltage. Plenty of current and the wee red led on the mount flashes but I've had no problems with it.
I'm switching to a converted 1 KVA UPS as a supply when I get time to modify it. Pull the 12 volts direct off the battery line ( + fuses etc ) and the UPS will also protect the rest of the gear while it charges the battery and feeds the mount.
Little PC supply is good on the bench though with + & - 12 volt, + & - 5 volt and + 3.3 volt. The modification is easily found if you google and safe enough to do if you are careful and understand what you are doing.
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