Raycaster: My attempt at a floor (failed)

This is my attempt at making a floor using Griffpatch's Raycaster series tutorial. Unfortunately, he never released an episode about making floors, so I tried to figure it out myself, to not much avail. Sidestepping and jumping kind of work, but turning is different, and there's only three slices of tile on the ground.

I basically just added more parameters so walls would draw at the edge of the screen, then I copied everything that makes the walls and inverted the X and Y in all of it (very complicated i know) and finally tried to copy the tiles several times to the right, then discovering that they weren't even consistently placed, and lagged out the whole project to oblivion.

I really wanted this done for the Dialtone update to SSS, but I just decided it wasn't worth it. I swear, if I ever switch engines, this will be the main reason.

(Oh, and hit the green flag twice.)