17th Aug '14, 21:03
As continuing education after a 20 year absence, I reviewed your problem of a few months ago. *By now you've no doubt moved on to other things. *However, the resolution would be of interest if you would chronicle it.
Notwithstanding, concerning the problem I'm no expert, but it looks like unfinished work. *If it were I, backtracking to the source if possible would give the answer. *In lieu of that, subject the information you do have to the 3F (form, fit, and function) requirements, and generate an adequate design and print (drafting).
This is a good problem for those of us who are green (as we say here in the USA), because as my earlier undergraduate Statics instructor told us: your greatest tool as an engineer is communication. *I would add that it is one of the general rules of life, applicable to all work.
Finally, I hope the following link is of some primitive help.* http://en.wikipedia.org/wiki/Datum_reference