Are you collecting with buckets, vacuum, or gravity tubing? How many gph is your evaporator- lots of info to become overwhelmed with, but we need to know what you want out of an RO.
I read all 57 pages of this RO/DIY forum before modifying the 2nd hand RO I bought. chenged from gas to electric and added a 2nd membrane.
With 200 taps you should be able to put together a basic single 4x40 with a procon pump on a 1 hp motor for about $1k. Flow meters are a must, hi & low pressure switches are a luxury but not a necessity. Just remember you need to make at least enough permeate each day to wash/rinse your membrane when finished.
http://mapletrader.com/community/sho....-Oh-My!/page8 This was one of the most helpful threads for me
'12 15 jugs - Steam pans
'17 125 3/16 - 18" x 72" drop flue on homemade arch
'18 240 3/16 - Deer Run 125
'19 450 3/16 - Converted RO to electric/added a membrane
'20 600 3/16 - Maple Pro 2x6 Raised Flue, added AOF/AUF
'21 570 3/16 - Built steam hood, Smoky Lake filter press
'22 800 3/16 - Upgraded RO to 4 4x40
'23 500 3/16 - Re-plumbed RO, new "Guzzler"
'24 500 3/16 - Steam Away, DIY 8x40 RO