Good afternoon, first to congratulate the beautiful design and Affinity Designer.
Good'm footwear designer to 10 years. some tool that does not have the competitors is the tool that are used in footwear software and also saw the Rhinoceros which greatly facilitates projects.
1 - trace tool that you will click and go skirting the object this tool is in Rhinoceros, Caligola and Naxos Teseo.
2 - Mirror Tool. You create an axis line and mirrors, and the mirror line is dependent on the other, thus altering the main line and the other line reflects altered too.
3 - Copy depedente the other line, thus changing the line copies the other and also changed.
Cases are interested in this tool, I'm willing to help!
Thank you