No its a good question, most players havent experienced a 0.5 speed. You need to remember that everything is half the speed of a normal world. What would take you 20 hours will now take you 40 hours. You need to incorporate that factor into your village builds. Hiding place for example is good if you need res fast, say after an attack. This world is dependent solely on farming for main resources. But if your cleared, waiting on Lvl 6 mines, for example to get you back into farming would take 9 hours or so.
I would agree on increasing mines but only after everything is done (acad, Stables Rax etc) the best way of figuring out build times for troops and buildings is via a build calculator eg
zomgtw. But your HQ would def need to be higher than normal: HQ at lvl 20 has a time factor of 38%, so a lvl 30 has a time factor of 23% - by using the above link, you can stuff around with lvls until you get one that is not only time efficient, but also not so heavy on farm space.
There is always an option of decreasing HQ levels after you have finished building, but as YGP stated, in a war you need to rebuild quickly. It not worth having a few more hundred troops when your wall take three times as long to rebuild.
Another interesting question is tech levels, would you increase your D techs, just in case or would you substitute lower D techs for a higher O tech? you only have 15 techs you can research, 2 already being taken for spears and swords. Considering a sword tech takes a while to build, not including unresearching the other tech. Your techs need to be thought out, esp with only one vil.