Thaumaturlogical Theoretician seems like a strange feat in that if one then takes a level with spellcraft as a class skill one loses the benefit? Maybe just instead have Feng Shui Student as a prerequisite? The feat is also a little weird since while it lets you avoid using spellcraft if you want to actually make any sort of Feng Shui you have to then have high levels of spellcraft still to qualify for the feats unless I'm missing something?

Feng Shui Shipwright seems good. I would allow other forms of major damage not just being split in to or being covered in coral; if for example it got covered in thick mud, or it got covered in mussels that should reasonably have a similar result.