The owner confirmed the bus was first registered in 2003. Pin it in
the vehicle sheet (C956E / Cursor 8 era, consistent with the Iveco
engine) and turn the blocking DREAL question from generic to dated:
2003 predates the 2005/39-41 seat-belt directives referenced by the
RTI dossier, so original TCP-approved seats need explicit
confirmation.
Deep regulatory research (15+ official sources, RTI 03.8.3 sheet read
in full): the TCP-to-VASP procedure is nailed down (13-item dossier,
seat reduction handled inside it, 86.90 EUR), but two blocking
uncertainties surfaced. First-registration date may forbid the
conversion or require a ministerial derogation, and no firm text
covers the sliding solar deck. Both flagged as blocking questions in
parcours-vasp.md and solaire-toit.md: DREAL first, fabrication later.