The plan shown is for a $4-$floor building. The floor height is $3m,F_{cu}=30$MPa and $F_y=360$MPa. The flooring weighs $1\mathrm{.}5k\frac{N}{m^2},$ the equivalent wall loads are $2\mathrm{.}5k\frac{N}{m^2}$ and the live load is $4k\frac{N}{m^2}.$ Form a group of $3-4$ students and design and detail the following:

The area between axes $3$ and $6$ as a flat slab or a hollow block system, give reasons for your choice.

The paneled beams, the associated slabs together with the surrounding beams.

The solid slab and its surrounding beams.

The staircase shown on the following page, determine the reasoning for the type of stair you chose.