Here is some sizing up, using the features of the shipyard.
Approximate width of second hull is 32 meters. Which may also be very close to waterline width. Perhaps waterline is 31 or so meters.
Width of main deck level of first hull is around 36 meters. Length is harder to deduce as the ship is not complete. The green line for the length is equivalent of 219 meters in length, but there may be more ship added, or more ship underneath the gantry crane.
Forward lift is 18 m long. Rear lift is 14 meters wide, should be enough for two large helicopters to be lifted at once.
How does that compare to some other LHD ships?
US Wasp class is 257 m long. waterline beam is 32 meters. Main deck beam is 38.5 meters. Max displacement is 41 000 tons
French Mistrale is ~200 m long. waterline beam is 32 meters. Main deck beam is 35 meters. Max displacement is 32 000 tons
We don't know figures like height/number of decks nor draft, but using the above figures It would seem the rumors about 35 000 ton displacement were true. The ship may indeed end up displacing around that much.
As you say, the hull is not entirely finished. Given that, it’s more reasonable to look at planned carrying capacity.
The 075 is supposed to hold 30 large helicopters. The mistral only holds 16, and the Wasp can carry 30+, or 22+ Ospreys, which are even larger than large helicopters.
Unless China has found a way to much more efficiently store helicopters, the 075 should not be finished but needs to be a bit longer.
40 000 tons full load seems like a reasonable estimate - marginally smaller than the Wasp, but significantly larger than the Mistral, which the carrying capacity implies.