How do you plan to finance the purchasing of assets from the SA government/tax payer, considering that they are national assets, not provincial?
To what degree do you plan to secede?
What will change under your party's rule? How will it be any different to the current Cape?
How do you plan to deal with the uprising against this movement? Not only from within your own borders but from the rest of SA as well? There will be violent protests to this - to deny this possibility is akin to burying your head in the sand.
What legal precedent will you use to support secession?
What percentage support would you require within the current legal framework to effectively secede, and what are your plans to garner such support?
What political party funding have you obtained and are you prepared to be as open and transparent as one would hope a political party would be, and disclose the contributors and the use of proceeds to date?
What are your reasons for secession? You have provided legal basis (which one can argue holds no precedent), but I haven't heard a plausible justification for this yet.
What currency will you use and what will this currency be backed by?
What international trade agreements do you propose entering into, considering that existing agreements are bi-lateral with SA and will therefore become effectively null and void? Do you expect similar conditions to proposed contracts? If so, you're in for a big surprise.
I have many more, but I look forward to hearing the responses to the above in the interim...