Custom design for tv wall with fireplace for a living room

I’m planning to renovate part of my living room. Specifically, the space currently includes a built-in metal structure and an old fireplace, both of which I would like to completely remove and redesign from scratch.

To help you better understand the space, once accepted (or in a private message) I will share:
-A Matterport 3D walkthrough (not public – it will be shared only with the selected professional).
-Several photos of the current space
-A few reference images showing styles we like (none of them are an exact match, but they indicate our general taste)
-Α dimensioned sketch with measurements

Key requirements & ideas (open to discussion):
-Construction of a new fireplace or installation of a gas fireplace (no natural gas available, only LPG) - I would like your opinion on this
-TV is currently 65’’, but the design should allow for a larger TV in the future
-Integration of LEGO display areas:
---The number of LEGO sets will change over time
---They won’t be permanent pieces
---Mixed-size niches would be ideal
---If LEGO is removed in the future, these areas could be used for decorative objects
---Possibly hidden lighting and bronze / smoked glass
-Color palette should match the rest of the house
-Storage space, including drawers and possibly a hidden mini wine cabinet
-The air-conditioning unit should be integrated or concealed
(it will be replaced with a new one, and the color can be selected – e.g. similar to the attached example or any alternative suggestion)

I would like a full dimensional sketch of the new construction, which materials, proposed colors, etc.