Loved watching my brother play this game growing up, it was a bit too complex for me! I've played OpenTTD a bit and seems quite similar. A question I've alway

Loved watching my brother play this game growing up, it was a bit too complex for me! I've played OpenTTD a bit and seems quite similar. A question I've always had with these reverse engineering projects, can someone build off their work to do a clean room reimplantation if they avoid any code/dissembly ?