Washer bottle relocation on a budget!

I managed to pick up a washer fluid bottle relocation tank when I first got the MX5 for £15. After carrying out some research it appears to be from 'Universal Intercoolers'. It comes in a kit which basically makes this whole post pointless, but I got it second hand as just the relocation tank. The original kit is illustrated below. It includes a pump, wiring, hose line, and the relocation tank. If you look at the tank on the bottom left corner, you can see the fitting for the hose to push onto. This means the pump does not mount to the tank and requires additional mounting. My idea is to remove the nib and replace with a hole and grommet for the OEM washer bottle pump. Firstly, I cut the nib off with a hacksaw. As you can see in the picture, it sits pretty close to the corner, if i were to drill the original hole position it would have no wall thickness left for a grommet. Basically, I center punched more to the left and up from that hole so th...