The castor angle & Rear wheel aligenment

[flyerncle]

Might be wrong Axle but castor angle is not adjustable and is fixed by locatation of suspension brackets.
Camber is done by the adjuster on the top of front and rear uprights.

Rear wheels could be done by making an eccentric washer that moves the lower arm in and out in the horizontal plane making it in effect shorter or longer and will move the front of the wheel in or out.

Hope this helps.