In design development the team fixes sizes, picks systems and starts the specifications. The drawings show more than a schematic set but still leave things out.
Example: a DD set shows a gym with basketball backstops on the plan. No equipment spec section exists yet, and no model is named.
DD pricing is budget pricing. Bid what the drawings show and say so in your proposal. List what the set does not show, such as models, finishes and quantities you had to assume. Expect the counts to change when the construction documents arrive.