Good to see some progress. As for losing the front and rear extensions, the way I understand it is that the chassis needs to be unmodified between the axles, so it's okay to cut the ends off what are effectively support brackets for a body that's no longer going to be fitted.
There's some helpful advice here, albeit written quite a while ago now -
http://www.nsra.org.uk/newforum/show...initive-thread
I'm not sure how the vehicle inspection part is being conducted now that all the local DVLA inspection offices have gone, but I believe quite a few have been done through the post recently.
Good Luck!