As billl said, moisture should be addressed with proper ventilation (fan). If you do not have one already, plan to put one in. I don't have personal experience with IKEA cabinets, though I have a disassembled one in my basement waiting to be installed as a utility sink. I read very positive things about the quality:cost ratio. Personally, I generally prefer drawers rather than cabinets. Anything you can do to get extra drawers would be good. Unless the subfloor under the tub is damaged or you damage the tub while removing the flooring, there should be no reason you need to remove the tub. And even if you remove the tub, you could probably still reinstall it. I replaced my tub (it was harvest gold) and there had been a small amount of water damage. I pulled up the underlayment and the subfloor was in good shape. With water damage, you really don't know what to expect until you finish demolition.

These are some great ideas ... to be clear, I can paint the cabinets no problem (have experience and appropriate equipment), but I have resisted over the past couple of years because we had higher priority things to get done in the house. We're getting past those now, so have time to go back and tweek. I like idea of crown on the uppers. Removing the cab over the sink is problematic ...it has an LED under it that is really important to the sink function ... will have to look and see if I can pull it, route the wiring into the ceiling and then back down into another dangly fixture that could match whatever ends up being over the island? Funny thing ... taking photos and then studying them actually helps ME! The fan is ugly ... but it is a wonderful thing ...maybe paint it white to match ceiling? (we did this to two fans in this house and two in another ...makes them sort of disappear). We replaced two in another house with dark brown ones to hook up with the dark woodwork ... it looks good, too. We'll look at replacing the glass on the two dangly lights ...it does need some contrast from the white ... since they don't do much, anyway, perhaps industrial stainless, dark gray, red or black?

Elizabeth, the floors have to go as they look better in photos. In person they scream cheap. It is cheap laminate. I will also have bare spots where the wall will be removed that I have to fix up. I was planning on putting some tile in the kitchen area but may just do hardwood throughout the whole house. I have also heard that the ikea cabinets hold up rather well but it seems that they use quite a bit of MDF with a foil over it. I personally would prefer a wood face as that sees quite a bit of abuse and potential liquid spills (I am just at the beginning with a 3 year old and 1.5 year old).

With the possibility of multiple cooks in the house, and children who will also be learning to cook and help in the kitchen, I'd include a prep sink on the island. Helpers can load or unload the DW, or gather dishes to set the table, without crossing into the prep path. I increased the seating overhang to 15"--the minimum recommended by the NKBA.I, too, live in a multi-generational, multi-cook, household--my daughter, her husband, and their two children live with me. I love my second sink!