The main requirement is a temperature-controlled hot-water bath for warming the chemicals, which are relatively easy to construct with some creative use of aquarium equipment. Buy yourself a digital thermometer from Amazon to verify your chemical temperatures (you should have one anyway for B+W development).
You may also want to consider a rotary development instead of hand agitation. If you can find a "roller base" unit, you can just place a standard developing tank on the rollers and it works fine. I love mine for B+W development too. Works like so.
E-6 is a little more complex than C-41 and I do not recommend the DIY kits in general. The DIY kits are a simplified 3-bath version of the full 6-bath process and has negative consequences for quality and long-term stability of the resulting slides. Since it's more difficult and the finished product is inferior I recommend just getting it commercially processed.
You can send it out at most supermarket photo centers, just mark "E-6 Process" on the "special instructions" box. It all gets sent to a processing company (often Fuji) and they know what to do with it. Nobody does in-house ("1-hour") processing anymore, sadly.
I live in a relatively mild climate and B+W development usually means measure the temperature of tap water once and go with it for the day. For C-41 it's also a bit harder to keep things at 39C which makers a larger gradient against room temperature than 20C, but in the end I suppose it's not too hard with a water bath.
I just traded two Mamiyas for a Hasselblad 503. The Mamiyas are fine, but I have too many systems to feed now.