Well, somebody asked me recently, having discovered that something was 1mm out on a model, "would anyone notice". I just said to him that he alone would and it would niggle away at him, even if no-one else spotted it. 24 hours later, he called to say that even though it was a pain to start from scratch, he would do it right.
If the layout niggles you constantly and takes some of the enjoyment out of the hobby, then start in the other room, I'd suggest. Could you keep the other one as backup to tide you over?
Richie.