The Chamber Church by Ziyu Zhuang | Video by the ADAM

Create Box1: create at pos 0/0/0: 14/24/13m:

• SplitFace: divide upper face at midpoint
• Move Surface Edges: -5m in Z-Axis
• Move Box1 from Midpoint to 0/0

Create Box2: create at pos 0/0/0: 5/5/31m:

• Move Box2 from Midpoint to 0/0
• Move Box1 2.5m in Y-Axis
• SplitFace Box2: divide upper face at midpoint
• Move Surface Edges -11m in Z-Axis
• BooleanUnion both objects
• Select all: MergeAllCoplanarFaces

Create upper fassade with Ellipse/Diameter in Front View:

• SmartTrack:  select reference points
• Create Ellipse: 8m/2.5m
• Copy (Alt/Shift): move up and scale smaller
• choose smaller Ellipses: move up 3.5m
• hide polysurface

Create upper window-opening in Right-View:

• Create 2 ControlpointCurves: connect Small and big ellipses
• Perspective View: Split ellipses with new Curves
• Delete 1 side of both ellipse
• EdgeSrf (SurfaceFromEdgeCurves)
• Mirror Surface in Y-Axis, delete curves and select and joint surfaces
• Cap object
• Show objects
• BooleanDifference

Create lower fassade in front-view with Ortho and Planar:

• Create Circle as entrance-gate, move up and scale 1D
•  Top View: Copy to additional position until top
• Scale position 4 smaller and 1&3 even smaller
• Right view: scale 1D position 4 on  7 m
• Scale 1D position 1&3 on 4 m
• Scale 1D position 2 on 10 m
• Delete first circle (0)

Trim and adjust lower fassade in front-View:

• Trim: circle on position 4 below main object
• create 2 polylines at circle 4 with Snap “Quad (Quadrant)” to bottom of main object.
• Trim remaing curve segments of circle 4
• Trim remaining circles below main object, join and transform shape with selection and moving points

Create entrance-portal in front-view:

• create circle
• add left polyline and mirror in Y-Axis
• Trim lower circle-segment

Finish curves in perspective-view:

• select two lines on X=0
• Select Curve on Pos 4 and lines
• SetPoints (SetPt) in Y-Direction to Position 4, join curves

Create inside-space of church in perspective mode:

• select all curves and loft
• unhide all
• Trim: select Inner-Surface and trim from buttom-surface of main object
• Select both surfaces and join: object must be a closed polysurface

Shape tower in right-view:

• create polyline at top as helper-line: -0.4m right and line up
• create ControlPointCurve until next point of shaped tower
• Delete Helper-Line
• Move and extrude curve
• Extrude Surface
• BooleanDifference object from main object
• Delete Curve

Create Contour in right-view:

• Contour: Select main object | set direction | set distance 0.4
• isolate new curves
• ExtrudeCurves (ExtrudeCrv): 0.125m
• Delete Curves