Lets not forget that inside of the base are only mecanical contacts (no wire) and the best way to build it and keep it small is the actual.
But may I ask why it will be better if you will have the side wick?
the reason I say set up for a side mounted coil is, the most flavor and least harsh vapor will come from having the coil right at the air inlet, less than a mm distance away, this gives the incoming airflow a jet stream that hits the coil and extracts the best flavor without adding any harshness to the vape... if the air is allowed to enter the chamber and expand and lose velocity before hitting the coil, or if it doesn't actually even hit the coil and just extracts vapor from the chamber this will add harshness and throat hit to the vape.
just about every really great tasting, high flavor profile atty will follow this rule. the kayfuns have become wildly popular because of the incredible amount of flavor they give without any harshness, and they do this by having the air inlet right below the coil, then the air outlet right above the coil... this creates a slip stream flow of laminar air around the coil and straight out the drip tip, extracting the best flavor. most side air hole atties like this are already at a disadvantage because of the fact that the airflow is more like an L, it must bend from inlet to exit, and the coil being so far inboard really takes it out of the main airflow stream, your only extracting vapor from the chamber and not directly from the coil. it does make a big difference. if you look at what are regarded as the best tasting atties you'll see that they virtually all follow this design. tiny chamber combined with jet stream of air right on the coil. a larger chamber reduces velocity and reduces peak flavor and adds harshness as a general rule.
I've used my chalice with a Z coil and a side mounted one and honestly, for me the side coil tastes much better and has no harshness that the z coil does give. if you really want to see then try it, 2 same exact
coils, but one mounted right at the airhole and the other mounted far away like the z... pay attention to sweetness and harshness and you will see what I'm talking about... now I'm not talking about a night and day difference here, the difference is fairly subtle but it is def there and it's def a difference for the better with the jetstream of inlet hitting the coil directly. everything else remains the same, chamber size and center drain, everything works just as well with a side coil as the z, just flavor is improved. to me all it really needs is a little difference in the posts, allowing more flexibility in the builds