It is fine if you get 3 starred in RR, just a fact you have to deal with until you are top tier.
For the rest of us that arent and play in GC, LL most web sites with base designs are just terrible.
Forget the in game editor, moving walls brick by brick is pointless.
There are 3+1 factors in designing a base, use base defenses as a supplement to their mercs. This means fighting where damage can be done by your defenses and not grouping your heroes in a single space where they can be attacked out side of base defenses or where they can be killed easily by singling one out on the exterior
Have your best defenses protected by strong hp items, this applies mainly in GC for lower levels , but if you only have a TH 11 it definitely applies.
Gold Vaults, HH and any high end HP structures are the best bet, walls are beaten by air born easily.
Have your best defenses protecting the base not the fields out side the base.
This is the 4th, do not put stuff in corners, it builds rage for the heroes attacking and frankly is annoying. Bases should be central and following the above you will win unless your base/heroes are just over matched.