Many thanks for your comments everyone - much appreciated. I have edited my post based on comments and to provide some clarity.
Namely:
the existing theme files are design-layer only (colours, fonts, nav injection) — not structural template overrides. No core Discourse templates have been modified. I’m not asking for any structural changes, more a have a quick look, identify any UI gaps and feed back.
My main ask is the development of the member profile page and related flows - happy for fixed price proposals to be put forward by interested parties - appreciating that the starting point put forward previously may have been low - so have removed it.