A lot of the dimensions are not critical and those I'm posting up are subject to measurement errors. Please double check the spacing between the holes to which the twin-injector assembly is mounted - I have measured off of the bracket but better to mark it out using the part you will attach to it.
The hole at the top mounts to the chainguard fixing and there are a couple of tabs that bend around this lug.
The tab on the bottom bends round the bottom of the swingarm. This is not a tight fit as I used some double sided automotive adhesive to stick this tab to the bottom of the swingarm.

BTW it's made from 1.5mm thick aluminium sheet (chequer plate ... but that's not important)
Don't forget to radius corners to avoid sharp edges and to relieve stresses.
Hope this helps
.... and Mango .... your bracket will soon be on its way to you
