Is there a reasonable scenario where enough people vote "no" here? It seems unlikely, so a nuanced discussion where pros and cons are considered seems more productive. Seems like a yes/no vote makes more sense if there is actual contention or disagreement among internal factions.
If you vote no, you'll basically be seen as the stickler person without a good reason.
18 people are missing (abstained?), so could that be interpreted as an ambiguous "no"?
In a slightly different reality, most members might reasonably vote no if it was deemed too costly for the organization's budget, or if the champion of the project was seen as unreliable, or if there were genuine concerns with the chosen contractor. Some of these could change after a short bit -- a sudden funding source appears, a different leader of the project steps up, or they address concerns with the contractor bid.
If you vote no, you'll basically be seen as the stickler person without a good reason.
18 people are missing (abstained?), so could that be interpreted as an ambiguous "no"?