How to built an engineered base

Hello guys.. a lot of debate for enginered bases. so far so long SC is not doing anything and we decided to built our own lineup of enginered bases. I recently upgraded from th8 to th9 and th9 to th10.. in new th9 I already put x bows and all defences in my home village but my base is an old base with the same th8 buildings and defences. The new th10 I did not buy x bow and defences coz some one told me even if I do it in my home village it is not an enginered base. So can someone help me telling this whether I should install x bows and other defence buildings in my home village not in war base or not to install x bows and other defences in home village as well as in the war base. Thanks..

For your new th9, it wasn't the best idea to add xbows if you were planning in maintaining a low weight. For now leave xbows at lvl 1,and concentrate on offense such us getting AQ, new troops, upgrade camps, spell factory, cc, etc. All this will take a few weeks to complete.
For your th10, when adding new buildings they are automatically added to your weight regardless if you add them to your war base. If you want an engineered base, don't add anymore defences and only concentrate on heroes, upgrading troops, spells, camps, and walls (they don't add much weight). You can upgrade traps and also teslas and ADs to max (for th10). Check out my base if you would like a good reference. #80G2GLGLG
I recently upgraded to th11 but weight is about the same as a max th9.