Need advice for a PSU, for powering 8 studio effects

[Praying_V]

I'm planning on building a 4-channel mic preamp, and also a 4-channel studio type compressor.  If possible, It would be great to put everything in one large enclosure, powered by one power supply.  Each mic pre & compressor requires + & - 15V.  I have all the schematics, but I'm not sure what the total current draw will be.  I'm also not sure how much I can get out of the PSU.

I'll probably use this transformer:
http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=122-605

This is the PSU I'll build to get the + & - 15v:
http://1176neve.tripod.com/id26.html

The comp circuit is here (i want to power 4 of these):
http://www.geocities.com/m_natsume/what_compressor.html

The mic pre circuit is here (also need to power 4 of these):
http://1176neve.tripod.com/id10.html

So what should I do?  It would be great if I could order everything at once, to save on shipping & time.  Do I use just one PSU with the transformer?  Would it be possible to power all 8 effects with this power supply?  Is there even any way of knowing without trying it?  I know of at least one forum member who has built both of these studio effects, and I'm sure plenty of others have completed similar projects.  Let me know, any advice is appreciated.

Thanks .......................................................ken