in response to saucerguy- id watch who id build for. if the customer takes out his freshly built arf and wrecks it they may say it was your fault for this not being right or that not being adjusted properly yada yada yada. while i agree on enjoying building more than flying- you may have a liability on your hands. id create some sort af waiver or some legal document with their signature exempting you from any and all liabilities. just my 2 cents
its like they say at work "cover your own a__"