We often pull our city gutters out, fill the holes with brick/cement to prevent rats, etc. and re=rout the gutter).

Our cost was ~ $34/sq ft ... but we still have to remove the old siding and replace it with new cement board {fire code}.

This is a minute issue. 40 sq feet of tile and some cement.

the few things you missed on are things that sound like you didnt have experience with - things an architect or contractor generally would know about, like you need insulation/underlayment for floors, maybe nails maybe glue all depending on which you use - you generally have to calculate a waste factor for most materials and it will be different say if you lay your tiles in a pattern or just straight rows, the size of the tiles will make a difference too - for sheetrock you have to know the costs of nails, plaster, green white or if maybe you really need cement board - so it looks like you need a prompting calculator or a rough estimate generator or a contractor or maybe just learn more and do it in excel yourself?

Haven't priced it out yet but I will probably pay between $2-$2.5k- sink $200, - faucet - $200, - backsplash $300 install, another $300 materials- I usually add canned lights in kitchen ~$80 per,- Flooring: If tile, I buy the $1 per sq ft ceramic so materials are cheap ($150), labor for that may be about $1k for a decent sized kitchen / If I do engineered wood, then about $2.50 per sq ft for materials and $2-$2.25 for installation- Appliances: about $1k, I don't provide fridge, just dishwasher, stove, microwave- Plumbing hook up - ~$250Bathroom:- I have had to demo walls before due to tile, so probably $300-$400 for new drywall if that is the case- Tile shower - probably around $250 for materials and $750 for labor (including cement board installation).

The wood is in better shape than the cement. 

Also, as I reran the numbers it cemented that I don't like the $300K price!

I bought cement and 2x4's and a few gifts for the girls... none of which were door buster deals.

Ricardo Feel free, one thing I also did with these cards was to carry a jar of rubber cement and and put a dab on one side and posted them places, eg by gas pumps when I was getting gas. 

I cleaned up the floor, ripped out what was too far gone to repair and laid down new cement board and tiles.