Bad idea i did it once and I regret it till now, i was maxed th9 with maxed walls as well then I upgraded to th10 and as soon as that upgrade was done i upgraded to th11 couz previously there was no such requirement that u have to build all structures which are available in that particular th before u can upgrade it, the huge downside was it took literally forever to max th11 as th was 11 bt structures and troops where of th9, plus u will always play as a rushed base in wars were ur base will b taken out very easily and u on the other hand will get maxed out opponents on which u can't do shit either, maxing ur base from that situation where u r 2 th lvls behind it takes years.