Dining room — surveyed plan

Best fit to your rough survey. Centimetres. Rotated to sit the way the rooms actually meet: the 284 wall along the top is the bottom of the main room. New door in the 144 wall on the right; murphy bed opposite, on the wall where the existing door is today. Eight sides, including a 7 cm kink at E.
bed cabinet, folded up 149 × 37.5 × 205 high 149 of bed in a 178 wall — 29 spare double bed, down 213 out × 149 wide 136 clear bed footprint keep clear TABLE 160 × 80 seats 6 73 76 70 82 pipe boxing 9 × 22 153 existing door — blocked up swings in, toward the kitchen new door window ↑  kitchen / living, the other side of this wall hall beyond side passage Spare / dining — 8.7 m² 284 349 144 47 92 39 131 7 43 46 144° 195° 198° 143° 128° 1 m
room floor murphy bed footprint, down proposed new door

The room

8.7 m²  3.49 × 2.84 m max.

Fit against your survey

WallYoursFittedDiff
Top (window wall)349349.00.0
Shared, kitchen side284283.5−0.5
S1 (new door wall)144145.2+1.2
S2131132.2+1.2
the 7 cm kink78.2+1.2
S34344.2+1.2
S44647.2+1.2
Bed wall (47+92+39)178178.5+0.5

Nothing moved more than 1.2 cm to make it close — that is a good survey for a freehand one with a phone angle app.

Angles

CornerMeasuredFitted
D144°151°
E1195°192°
E2198°195°
F143°148°
G128°126°

The 7 cm kink at E was the missing piece. With two corners there rather than one the room has eight sides, whose angles must total 1080° — and your five readings plus three right angles come to 1078°. Every figure you took now has a home.

The useful coincidence

Murphy bed on the old door wall

Still needed

Your survey, marked up survey
The room a
Window end, bed head in the corner.
b
Window with the bed alongside.
c
Existing door, with the angled wall beside it.
d
Wardrobe against the angled corner.
The walk from the kitchen w1
Leaving the main room — blue tape marking the new door line.
w2
Doors at the far end of the hall.