To be honest I've worked a lot with Source and it's certainly not an engine that one would pay another person to make custom content. I think it's kinda silly to pay a person to make something for such a simple engine. Now if you're talking high detail and all that stuff, for a next-gen engine then sure but certainly not for an engine as old as this one. Why? Because i could literally knock out maybe 5 models a day depending on what it/they was/were and that really isn't worth being paid for and if i asked you to pay me then it'd be an insult to your intelligence and also disrespectful. I've sold models here and there on Turbosquid but, to be honest, that was only to see if people would even buy them. Not that i made crap or anything i just wanted to see how good i was at modeling lol.