No, I was just saying that project that doesn't have defined strategy or backbone before you start working on it, is a bad one from start.
It doesn't have to be crystal clear, but it has to be at least transparent enough to see from the start to the end.
Because you can lose, time, effort and nerves also.
There are funny projects and there are difficult projects, and challenging, and then there are nightmare project where you don't even know why are you trying anymore and if anthing goes wrong you are to blame, because someone has to be. And those later often start as a projects without proper study design or goal or something. That's why I warn everyone to beware of the fish that stinks already the first day. but that was not the main point. The main point was that you SHOULD have project outline before you start cloning something.
And I don't know the prices of mice and transport from Japan, but I would seriously doubt that it's more costly than to generate a knockin anew. Mice you can breed to get more of them (you would need to anyway from the transfected hybrid). If the mouse line exists I really think making a new one and starting a new line is neither cheaper nor quicker. If you do it in-house and are not a mouse-generating lab, then definitelly not quicker.
But maybe services today gone very cheap and you only need a kick-ass vector for that. But I don't think this is the case. Making knockin mouse by vector and homologous recombination was a several year project in the past, sometimes as a proof of concent too, but there was no other option. Now you can buy it.
So, maybe you have several years to startt from the scratch, it's a nice side project, you know, to "build a mouse". But if they need the mouse now, for testing a hypothesis, I really thing it's better to buy the mouse (also, if you make a new knockin, it has to be characterized, so to prove that only has this transgene, existing mouse lines has already been characterized, so more work again).