Bricks, Masonry, Asphalt and Concrete - first time block chimney

I am thinking of doing my own chimney ,block and liner only, at least the bottom part. It would sit on the slab and go up thru a floor with I beam joists and then go up another 7 ft thru the ceiling.Low ceiling. I might wait till spring to do the second floor phase. No reason I cant do the bottom now..I can keep the bottom floor about 60F for construction. Normally its 50.
I can adjust the placement so I dont have to cut any floor joists...dont know
what I will have to cut to get it thru ceiling but dont mind that.
I want to be able to connect 2 stoves to this chimney. A 6" upstairs wood
and a 4-5 downstairs for wood or pellet or gas.
Do I have to do a double liner for this..??? Are there lightweight blocks these days for the block..?? What can I expect to pay for blocks and liners.?
I want a clean out of course.
I think I will be ok if I just place 2-3 blocks a day and use the level intensely.
How about some info from veteran block folks or DIYs who have done this..
thanks

I'm not a mason but I have built a few single flue chimneys. My first concern would be does the slab have a footer or sufficent strength to handle the load all that block will have? Each stove will need a seperate flue. You can't connect 2 stoves or even a gas water heater and stove/furnace to 1 flue.

You can call your local block supplier for prices. They usually sell mortar too and cheaper than a big box...... and blocks do seem to get heavier the higher up you go :wall:

the slab supports 9 other block columns that make the posts for the post and beam design. They happen to be
about the exact size of a small chimney. No problems or cracks to speak of in 8 years... so must be ok.

You sound like a hard worker... lol tackling a chimney is more than most would attempt, but since your gonna try I might as well put my 2 cents worth in... a solid THICK footing on compacted gravel to support it is paramount. if you dont know your slab was built that way, IN THE SPOT where your building then you MUST assume its just a slab. everything else is pretty self explanitory. they even make casted block with 1/2 holes formed into them to allow for your piping. youll still need a saw to cut a hole in the flew. I dont know if Id lay just a couple block a day... if anything mix up a bag of spec mix and keep laying til its gone. youll get a few feet at least. personally Id go for it, and set a goal... like to the floor level one day. getting through the floor the next time, through the next floor the next time etc. itll turn out a LOT nicer if you do as much as you can while your 100% focused. dont try and cheese out by attempting it off a ladder or some crap. bite the bullet and get scaffolding. its cheap compared to a Chiropractor. you can prestock everything you need for the day and your not gonna kill yourself. good luck. sounds like you have the carpenter stuff handled. You probably already know this but a type s pre mix would work great for you.
ps. when you get near wood, hammer in some wall ties and place them in the mortar joints. a multi story chimney 16by24 inches wide, will make it wanna move.
ps. a margin trowel works pretty well when it comes to spreading your mud for the flew, and sealing inside it. a normal masons trowel for the block....
Ive seen chimneys pull away from walls and falling, and pushing roofs over. you dont wanna take a chance on the footing.