Source: "Germany's Fighter Competitions of 1918, by JAck Herris":
Span: 9.68m
LOA: 7.02m
Height: 2.93m
Empty weight: 632kg
Loaded: 861kg
Wing area:14.3m2
So compare to D.VIII:
Span: 8.34m
LOA: 5.866m
Height: 2.82m
Empty weight: 405kg
Loaded: 605kg
wing area: 10.7m2
So size is larger, weights higher as you would expect for a bigger and heavier engine.
The book also contains a scale drawing of the V.29 in 1/48th scale.