there is too little info and details in your opening remarks for anyone to give you any meaningful advise
Many machinery companies also has many design engineers....
Somemore it's your dad co.. what can be better than that....
if cannot use autocad, ask him to employer a person who can, so you just sketch and he will convert to mechanical drawings.. no technical background, ask him to employ someone who have.. then he'll do all the calculations for you.
Your job? design lor..
A true photograph need not be explained, nor can it be contained in words.
Its the age factor, ts has mentioned bout the disadvantage of hitting the big 40 or close to getting there. Me, being in similar age range, i do emphatise with ts in some way, most employers do avoid hiring folks if they arent in the range of 18s - late twenties.
It's frustrating when countless applications and resumes sent, out, all you get is silence. No replies. At best one or two will inform you of non-selection. It's painful. And if you got a family, it becomes a dilema.
Would you settle for a lesser paid job or do something you have no interest in to support the family (but you would be unhappy in the long run), or keep trying to secure the job that you really want, but the time taken is uncertain...and when you are coming to 40...time is definitely not on your side, hardly any employer would take a sniff at your resume after seeing the age.
Ts, is the above more or less represent what you fear of now? Correct me if im wrong.