If you are on a concrete floor all you have to do is get a mud base ceramic tile and your drain does not have to be centered for it to work as long as you slope to it. YOu might go in the remodeling forum to get more accurate info.
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For information on how to build a water tight conventional shower pan, take a look here:
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http://www.johnbridge.com/vbulletin/showthread.php?t=5434
You can achieve satisfactory results using either conventional built-up shower pans or Kerdi and similar systems, but based on my experience inspecting tiled showers you are more likely to get a satisfactory result using the latter - it's not that the former system is especially hard to do, it's just that it's becoming harder and harder to find people with the skills and experience to do it properly.
One other thing to consider: there is a temptation to assume that because a shower pan is being installed on a slab, installation is less critical.
However if somebody is installing a tile shower on a slab there is likely going to be finishing the floor surface outside it, and you are already going to have all the other issues and concerns involved in selecting and properly installing a satisfactory covering material on a concrete slab - a material inherently prone to cracks and often in a below grade location especially subject to water intrusion.
Water leaking under a slab from a defective shower pan only increases the likelihood and potential severity of problems with floor coverings, and you are not going to have the option of coming at such problems from below to correct them.
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Home Inspection: "A business with illogically high liability, slim profit margins and limited economies of scale. An incredibly diverse, multi-disciplined consulting service, delivered under difficult in-field circumstances, before a hostile audience in an impossibly short time frame, requiring the production of an extraordinarily detailed technical report, almost instantly, without benefit of research facilities or resources." - Alan Carson
http://www.johnbridge.com/vbulletin/showthread.php?t=5434
You can achieve satisfactory results using either conventional built-up shower pans or Kerdi and similar systems, but based on my experience inspecting tiled showers you are more likely to get a satisfactory result using the latter - it's not that the former system is especially hard to do, it's just that it's becoming harder and harder to find people with the skills and experience to do it properly.
One other thing to consider: there is a temptation to assume that because a shower pan is being installed on a slab, installation is less critical.
However if somebody is installing a tile shower on a slab there is likely going to be finishing the floor surface outside it, and you are already going to have all the other issues and concerns involved in selecting and properly installing a satisfactory covering material on a concrete slab - a material inherently prone to cracks and often in a below grade location especially subject to water intrusion.
Water leaking under a slab from a defective shower pan only increases the likelihood and potential severity of problems with floor coverings, and you are not going to have the option of coming at such problems from below to correct them.
----------
Home Inspection: "A business with illogically high liability, slim profit margins and limited economies of scale. An incredibly diverse, multi-disciplined consulting service, delivered under difficult in-field circumstances, before a hostile audience in an impossibly short time frame, requiring the production of an extraordinarily detailed technical report, almost instantly, without benefit of research facilities or resources." - Alan Carson
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