Wanted - Omnigraffle designer

We require an Omnigraffle designer to do freelance work to draw schematics for solar hot water systems. Please see file in Dropbox below:

We would prefer to organise the work through UpWork or a similar freelance platform for protection for both of us and ease of financial transactions. We are based in New Zealand.
Please write to me at info@apricus.co.nz for further information.
Cheers, Marcus