Now up to a magnificent 18 answers, 14 of which are in my tentative grid. Struggling to parse a number of these beasts, 3d in particular has me mystified.
Thanks to Candledave for your post #5 confirmation.
I have three cells with double letters where either letter could produce a new word. Experimenting with various combinations hasn't produced a likely object. Having another look at it tomorrow may help.
I have made tentative starts to filling in the grid in three corners, but the north west is completely empty as yet. Hints to the first across and down clues would be hugely appreciated, provided of course that this does not contravene the rules if this site.