Well at this stage they seem to be moving quite fast
The exciting part is that the Melon Flower has lost almost all trace of fecal/sulphur smell and now has faint citric smell.
Here is a closeup of the Melon "krausen", it looks frothy like a nitro beer head
I haven't seen anything I would call mould, at least nothing black, green or something hairy. Fingers crossed it stays that way.
Plan is to let it go for a month and then check the gravity and ph (if my meter arrives by then) and perhaps dare a taste!
Thanks for everyone's input, it's been really interesting and valuable.