Additional points for crane specification:

Whilst looking at the initial sketch of the crane it is very important to take into the account the following :

1) The weight of the crane :

A crane which is going to lift 1000kg in weight is not going to be easy to lift as the boom and base will be quite heavy. Therefore it is essential that hollow sections are used for the struts etc. This will decrease the weight of the crane and can still give a reasonable amount of strength. The materials associated would be alluminium or steel. Alluminium would be more desirable but may be more expensive.

2) Hand winch

If you can lift 1000kg then we can make this crane just for u, hoooooowever, it is likely that you can not lift such a weight. The winch in the design would be manual rather than any other option hence we need some kind of a gear system for the winch . Maybe at a 15 to 1 reduction ratio reducing the amount of load from 1000kg to 66 kg etc etc.

3) Standard sections

All diameter of holes need to fit standard sections/tolerences. This would give ease when manufacturing such parts.