Power supply questions

I hate repost my recent questions, but I really need some help in
building a power supply.

Questions below:

My Taig mill is ordered, and one of the things that I have to do
while I wait the 6 to 8 weeks for delivery is make a power supply.

There's a few things that I'd like to ask the group to get me
started...

First, I am wondering if my choice of caps is correct. I will be
using a 30 volt transformer to supply power to three 24 volt servos
rated at 6 amps peak. I doubt that it will ever need to supply more
than 12 amps at once, if that much, but let's assume that the maximum
current is 15 amps. I am looking at some surplus capacitors rated at
17,000 MFD, 75 VDC. Would a pair of these in parallel be sufficient?

Second, I wonder if it is ok to attach a smaller transformer to the
same AC input that is hooked up to the main transformer to supply 5
volts to the Geckos?

Third, how does one calculate the rating of the fuse that is needed?
I assume that it should be a slow-blow type, but what would the
correct amperage rating be? A little over the maximum current, a
little under, or dead on?

Thanks,
Tom Murray