That's good news then, should be OK. Apologies for being the bearer of bad news.
Looks a nice clean car, where abouts are you based?
My recommendation would be to paint your tow hook red or something, now you have a big arrow pointing at it, that'll make it look nicer imo.
I bought one at the beginning of the year for £350. Was a cat c had been repaired and worked perfectly well but I only wanted the engine out of it so it didn't matter.
I agree with these guys that your budget is too low you won't get one that cheap but they are about you just have to know where...
You could mount it using some universal bucket seat mounts, £30 on ebay, which will bolt directly to the floor. But as Steven says you'll need to use load spreader pads on the under side of your floor.
Found a modded fuel rail in a box of spares that came with the micra when I bought it many moons ago. No need for it so I'll create a for sale ad soon. But just to confirm, purple side feeds are 370cc SR20DET injectors aren't they??