Clone the catalogue or parametrise it

Copy-per-model was the fast choice for a four-month job; here is what it cost.

The second and third vehicle models were delivered as full copies of the first catalogue, plus a landing page to choose between them, instead of one application with a model parameter.

Fast to ship, and the copies drifted within weeks: fixes landed in one and not the others. For a four-month engagement with a fixed end, the copy was right.

Takeaway

For anything meant to live, the parameter is right, and the moment to add it is the second model, not the third.