We are looking to try and update and repair our patio that's been enclosed as a sunroom (even though it's North and West facing). I've attached a GIF of an elevation (looking on from the North). The space is approx 400 sf. The house was built in 1956. Not sure when the room was added, but the concrete looks to be 3 separate pours (with the last one being as high as the overlay, up under the window in thae back).
I'm looking for ideas on what to do along several lines. 
I'm being told to NOT spend too much for now (so I can't replace the floor nor the posts like I'd like to do). To that end my ideas/plans/priorities:
- 1st: Floor
1) removed the broken up overlay (cementeous dirt+straw).
2) discovered concrete slab with good size cracks in some of it.
3) prep'd the cracks (using chipper gun)
4) at this point...
a)
choices: not sure whether fill/repair with cement (hard), or "mastic" or 2-part epoxy (both been told are called "soft"). I understand we need to do any pest control/treat for termite or ant "highways", and fill the cracks with sand up to 1/2 inch before we repair the cracks.
b)
finish ideas: do we paint?, epoxy coat? or stain? I understand we need to pressure wash, and "finish grind" (with what?) the concrete before we do any of these options. OR do we look into hardwood/ipe decking? or even rubber tile? (as these have also suggested to us so far)
Any help you can give me on 4) a) and b) is MOST greatly appreciated.
- 2nd: Redwood and Fixed Windows.
The outside is 8, 4x4 Redwood posts and 6 2x4 ones all holding up the light-metal roof and framing 5'x5' plates of glass with redwood boards nailed vertically under each window (inside and outside).
What do I do with this? 
- I think I can/ought to sand, prime and paint it at a minimum.
- Also I'll need to rip and put some kind of redwood/cedar under about half of the wall as a support since it was resting on the overlay.
What else?
- Can I do any more to "finish" the lower sections/boards of redwood?
- Can I add vents below the fixed windows to give the room some breeze/breathing venting?
- Split 5x5 windows have been priced at $220 each (for 6 of them). That seems like a lot of work and maybe cost more than I want to do for now.
- 3rd: "interior" Walls.
These are stucco in a sort of "knock-down" texture. These are even more open to whatever ideas anyone can give.
- I'd like to patch all the penetrations made by previous owners of this former exterior as a minimum (holes for shelves, holes for plant hooks, holes for cables {Cable TV, telephone, speakers, etc.} strung under the house, etc.).
- I've also thought about re-texturing 2/3rds of it so it is "smooth" and matches the adjoining interior rooms.
- The other 1/3 could be paneled up about 32" high (and knock-down stucco above that)
a) with hardie-panel (vertical to match the redwood on the exterior of the sunroom), or
b) with old-brick (to continue the theme on other parts of the exterior and raised garden-bed walls, or
c) with ipe wood (as one friend has suggested)
What would you even consider, much less do?
Finally, do we add heating and either venting or A/C just to this room?
If so how? Its cold in the Winter and buring up/stuffy in the Summer.
Yes, I tend to be the big picture and economy of scale one, and I leave the small details and finishing to my better-half. So we are tending to eventually balance each other within the schedule and the scope of our DIY/Home Improvements.
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