Cost + timeline + your credentials for a B2B salon-supply Magento build?

Realistic ranges for a B2B salon-supply business at $500k, $5M GMV:

• Audit: $499 fixed-fee (~20h @ $25/hr). 5 business days. Written gap review + sized scope for the build.
• Build: $4,999 fixed-fee (~200h @ $25/hr). 6 weeks. Includes catalog + license verify (3 state APIs + manual queue) + customer-group trade pricing + Wella Pro + L’Oréal Pro brand-portal access + 3-state tax-exempt cert workflow + state chemistry matrix + subscription integration + Hyvä storefront.
• Custom enterprise: quoted. Multi-state (5+) license verify, multi-brand (Wella + L’Oréal + Olaplex + Redken + Schwarzkopf + Goldwell), school partnerships, distributor drop-ship (SalonCentric / CosmoProf parallel feeds), multi-region (US + UK + AU). Typical $25k, $80k engagement.
• Hosting: $400, $1,500/mo on Cloudways / dedicated. Subscription auto-ship traffic is steady; brand-portal contracts may require specific compliance hosting (SOC 2 in some cases).
• Ongoing: $1.5k, $5k/mo retainer for quarterly license-renewal sweep + monthly trade-price reconciliation + state DOR rule + chemistry matrix updates.

My credentials: Adobe Certified Magento + Hyvä developer, 7+ years of B2B professional supply builds. Specifically familiar with brand-portal contract politics (Wella Pro, L’Oréal Pro, Olaplex Pro authorized-dealer requirements), state cosmetology board API integration, per-state tax-exempt cert workflows, and the SalonCentric / CosmoProf competitive dynamics. Public reviews on Upwork.