Clan Wars Base Layout

So two questions, your war base is essentially "locked in" at the end of the preparation day? So it would be best to wait until the last hour to switch from a farming base to a trophy hunting layout (or something a little more extreme)? Is there any way to lock in your war base ahead of time? I have some layouts in mind but I don't want them to be taking effect in my village for the next 24 hour.

Secondly, what kind of base designs are you guys using? Storages outside walls? Using them as tanks? curious to see what people are planning to do.

bump

anyone?

Until we have multiple saved layouts, I am using a convertible hybrid base.