I would forget about the first one as its much to deep for the Pulsar. The second one looks as if its a better fit , love the flat floor too.
To save weight its better to get it all to fit , cutting and shutting etc then take a mould from it, keeping the splitter and the floor a seperate mould each. Dont forget they have to fit a standard bumper, so making sure they fit makes life a lot easyer. Its easy to remake if damaged so DO NOT cut the bumper to fit you cut the spoiler to fit. I am also thinking of making the front and rear bumpers in G/F over the winter. So joining the spliter to a G/F bumper would be easy, either bold it or screw it.