You will make everyone lose time, plus the builders may not see you as someone serious and may refuse to do your furniture. No one wants to start their work and in the middle of it to have their clients reconsider over and over again. You will make their work harder and you will have your furniture later than you wanted. Think it through and stick to the model that you love the most. Of course, see what matches your interior and if it fits the available space you have, as this is important.