Oh boy, first time tackling Half-Life itself after years of mapping CS1.6.
This is pre-alpha state work in process. I can get from first (c0a0) level to second (c0a1), but when I return (to c0a0) it spawns me at hammer origin outside the map. I tried several suggestions on the internet and it made things worse. I added .rmf files (most textures used are default (came with the game, slight modification was made to halflife.wad to enable flashing fluorescent lamps)) and UI files to show some modifications I already completed successfully. Any suggestions would be useful._