I deeply respect HL1's textures but be prepared to get criticised for the low resolution/blurriness of them.
If you take the effort of porting the map you could try to replace those textures by HL2 ones. Especially considering the simple concrete theme.
One more thing though: I often think that HL1 map conversions loose a lot of their character with unreasoned texture replacements. Grey rocks where there were red ones in HL1, dark brickwalls where there were bright concrete textures ect. So to some extend I respect your decision to go with the original textures. But the low resolution really doesn't look appropriate today.
Anyways, Merry Christmas!