IMO, and this is just my opinion, mech mods are more so suited for lower & sub-ohm builds. If you have no intention of dropping down to below 1.3 ohm builds, there's not much of a reason to buy one as a VV/VW mod will be more than sufficient for anything above 1.3 ohms (which is the general "cap" for VV/VW mods, meaning they won't fire a coil below that resistance).
I bought a Nemesis Clone (HCigar) because I wanted to venture into the .5-.8 ohm builds. They simply suit my style of vaping better than the higher ohm builds. It's not for the huge clouds, it's for the concentrated vapor production and flavor that these style builds yield for me and my DIY juices. I topped the Nemesis with an IGO-F, built a coil and rocked it. It took about 1-2 minutes to build the coil, another 1-2 to install it and then 10-20 seconds to thread a piece of cotton through and juice it up. From there, vaping bliss.
I use the stock airflow hole on the IGO-F, so no drilling needed. It works, packs a punch in terms of TH and up until recently, has served me very well. I'm now looking for a slightly larger building deck and drilled holes in the posts so I don't have to wrap coils around screws. That's the only issue with the IGO-F, to me.
As for batteries, a 30amp battery is *not* required for mech mods. Are they nice to have? Yes, are they required? No. A 10 amp battery will work for quite a few sub-ohm builds. As an example a .5 ohm at 4.2v comes out to 8.4 amps, so a 10 amp is in that range. Anything lower and yeah, I'd look into a higher amperage battery, but you don't *have* to have a 30 amp.
As for rebuilding in general, if you go the micro-coil route, you won't be spending as much time building. An MC can last weeks to months if you take care of it; I've had one last nearly 2 months before it just broke due to the heat of a .4 ohm build I had running. That means it lasted through numerous (cotton) wick changes, dry burns, rinses, etc. In that time, I used about a whole cotton ball for a wick (which is 20-30 times cheaper than a single coil head) and went through a good amount of juice, but it was all worth the effort of dripping.
All you need is a 10ml-15ml bottle in your pocket and you're set for dripping

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