BrotherVord wrote:Make sure you use a good quality primer too, paint doesn't adhere to metal as well in my experience so you want something that's a real primer that will chemically bond with the model as much as possible.
Solid advice, that. On the painting end, that's all you really need to worry about - once the model is primed (and allowed to cure a bit), you're just laying paint on paint, same as with any other model.
Model prep may or may not be any more difficult, depending on the sculpt and your available tools. White metal is soft enough that you can cut thin parts with a knife, but scraping mold lines is less effective than on plastic (you aren't usually removing material, you're burnishing... with a tool ill suited to the task, no less). Files and emery boards will do a much better job, here. I like to take some fine steel wool to metal models, too, if they're looking a bit rough or oxidized, to get a nice, smooth surface (where appropriate). Not sure how many pieces the Mordians come in, but if they're multi-part, you may want to pin some of the joints, which adds to the construction time. Looking at
GW's website image, though, I would guess that most, if not all, are one-piece affairs. As for customization potential, metal can take some limited bending and reposing just by hand pressure. Beyond that, it's pretty much the same as plastic, except it requires a bit more elbow grease when cutting and drilling. The number of pieces per model has more to do with a kit's potential flexibility than the material.