Can't find Solidoodle 4 Information PLEASE HELP! (Repetier)

An SD4 is just a pretty SD3 so any of those settings are the same.
You are correct about the park button.
As far as the Z goes does it crash into the nozzle?  There is a knob on the back that you turn to adjust the z-height limit switch.  The switch hangs near the rear right of the moving platform.  Make sure it lines up with the screw that goes through the knob.
As far as shape it is supposed to be 200x200x200 but the SD4 has a fan on the left of the carriage that may limit that so start at 190 and if there is more space you can increase it.

Just added a picture. Regardless of whatever limit switch appears to be there, the screw will just pull up. Looks like it's about to be ripped off by the bed moving up...

I just got it - don't they test these things? It says they do...

I can hit the switch with my fingers (appears to be the red switch UNDER the metal tab. But this creates another reaction.

I have no idea how the heck to get this thing working. That hand screw thing appears to serve absolutely no purpose other than being ripped apart by the bed moving up. There's no documentation on any of this too.

I don't know what I'm supposed to do here. What happens after I trip the switch? Every time I reopen repetier it seems to be a new everything - there's no continuity of settings..

Figured out the z thing - metal tab was bent like an arch so it didn't actually catch the red switch...

Still everything else to figure out now!

The first time the switch hits, the bed will drop down and come back up a gain but a bit slower - all the homing works like this, it's supposed to make it both quick and accurate. So yes, you would have to tap it twice all up to stop the bed. If you get some reaction from pressing the switch while it's homing then it's working fine.

You should be able to press the metal tab, which will then press the red switch. Is this not happening? Is the metal tab jammed?

Hmmmm... Seems to me to be a bit of a design fail, that the bed hits the thumbwheel before the screw hits the switch... Given other SD4's do work, I expect something is not right with your particular printer. Can anybody with a functioning SD4 illuminate what might be the problem? Is there supposed to be something on the end of the thumbwheel screw for example?

Good to hear - I'd recommend your first print should be a replacement z screw holder if it looks delicate as you describe!

The machines being made of many printed parts is both a blessing and a curse - on one hand they can be a bit fragile at times, but on the other hand you can print new (even improved) ones on a whim.

I'm not sure whether it's been done already, search on thingiverse for 'solidoodle z tab' or similar to see (someone here might be able to point you further), otherwise just reverse engineer it a little - it's not a complex part. If you find one for an SD3 it's likely to be similar enough anyway, even though the screw has the thumbwheel on the SD4.

The metal tab is part of the switch - they are bought as one thing. Look up "limit switch" on eBay and you'll find lots of alternatives (although be careful - the hole spacing / overall size varies a lot). If it's working now, just hang on in there, I think you'll be OK.