Well you've created an incredibly compact base, but with theoretically infinite expansion ability. Most people are approaching this case in one of two ways; how can I maximize the performance in the base xs case, or how can add the minimum number of top hats to optimize performance given some particular metric (i.e. a small top hat for just enough air clearance to bring system temps down, or a large top hat for an AIO rad to gain sub 50/60 CPU temps). I've been planning to custom loop in this case, and I've been considering going a different direction; what would be optimal in any case? Can I fit it in the Ghost? Two large top hats would fit a 60mm EK XS 240 rad in push/pull with 25mm rad SP fans. Two large top hats on both sides would allow for this setup twice, one for the CPU and one for the GPU. Either push all the air through the case bottom to top, or if there's enough ventilation in the middle of the case (maybe with the vented glass panels) push air out the top and bottom so both rad stacks get relatively cool air from the middle). The whole case would be 416mm tall, which I've measured out, and might be impressively tall and skinny (rather than awkwardly tall and skinny), but a render would help me decide!