Hello! Almost everything that streets.gl needs for 2.5d buildings is supported by planetiler out of the box. It implements 2 key things that are planned in planetiler but not implemented yet that they wanted for higher-resolution data (see diff):

• snap coordinates to 65536 grid instead of 4096 used by default for planetiler. Planetiler should eventually support configurable tile extents but it's not been implemented yet: [FEATURE] Configurable tile extent per zoom in the output #1286
• generate tiles to zoom 16. Planetiler is currently capped at 15 but it shouldn't be hard to extend that to 16+ (see discussion in Why MAX_MAXZOOM = 15? #506 )

Neither of these are strictly necessary for showing 2.5d buildings in something like maplibre but they are needed by streets.gl frontend.

Do you have some examples of things you want to do but aren't able to with maplibre (mvt+terrain+building extrusion+3d model support) ? We are in the process of adding maplibre vector tile support to planetiler which will eventually support for 3d features. I haven't looked much into the true 3d tile formats though, if there's a data source and use-case it might be possible to adapt planetiler but currently it's optimized for the 2d web mercator tiling use-case.