Hello guys, new to this forum. I've been watching videos and tutorials all day. I have lots of solid modeling and assembly experience, as well as sheet metal, in Solidworks. I have no surface modeling experience and I think that's what I'm going to have to learn super quick to get this done. I've been tasked with adding a "water jacket" to a cylinder head. Basically, I need to create voids within the model for coolant to flow. The void should be offset from EVERY internal surface feature by .250". A simple shell function attempt failed (I'm not surprised). So I tried to create an offset surface model, knit it into a new solid model, and subtract it from the original solid model. Needless to say, I failed. I'm going to attempt to attach the original model here and hopefully someone can give me some advice. I did not create this model, btw... I'm just supposed to create the water jacket voids.