Inspired by your question and Tristan Croll's comment that the AlphaFold database has human proteins longer than 1400 amino acids computed as separate 1400 amino acid chunks I made a ChimeraX command "bigalpha" that loads and aligns these chunks.
https://rbvi.github.io/chimerax-recipes/big_alphafold/bigalpha.html
I attach two images and a PDB model made by running that command in ChimeraX for 5005 amino acid transmembrane protein
Q2LD37 | K1109_HUMAN Transmembrane protein KIAA1109 OS=Homo sapiens OX=9606 GN=KIAA1109 PE=1 SV=2
and also here are a few other examples I looked at yesterday.
Keep in mind that the pieces of these models are not aligned in a reliable way and probably clash badly with each other because AlphaFold did not compute them as part of one structure. So these structures should only give you a very rough idea about the protein.
Tom
This is the confidence coloring determined by AlphaFold, red low, blue high confidence. To reproduce this color using ChimeraX daily build open the PDB model and type command "color bfactor #1 palette alphafold". (The confidence value is saved as the bfactor in the PDB file).