I would like to make a one piece mould (less work) of the front of my Elan so I can make a one piece flip front. The bonnet will be fitted and blended in prior to making the mould. I can't see any locks. The mould should flex around the wheel arch lips. Can anyone see any problems?

This is a project I realised for Westfield Deutschland. The bonnet is quite the same "project level" and type than the one you are planning. Half a car, cf sandwich, 4 piece mold, a few difficult areas in the front section, a great plane in the back. I reshaped an original bonnet for the pattern. And your project would contain to convert a car to a flip front, which was not ment to be a flip front. Holy cow, i can't count the problems that this might lead into.
I used resin infusion, mainly because I know ri very well, and because this way I had the freedom of choice when it comes to the used cloth. But even with years of experience this was quite a project. I managed never to fail an attempt, but I learnt from every one.
Your "20% skill level" is not a fixed number, and there are lots of ways to improve it. For example by discussing with people with more experience. But some practice can't be matched with theory.

That's why I am talking to you! I don't recognise the word problem however, I call them challenges :-) If this stuff wasn't difficult and challenging, what would be the point in doing it?

Practice and experimentation are very important. When I started to replace steel bolts with titanium I thought that they were still too heavy and could be lightened.  I experimented with centre drilling non strength critical bolts (titanium bolts fit between 10.9 and 12.9 steel bolts in tensile strength) and at first got through one colbalt drill per bolt. I can now drill over 30 bolts with one 3mm drill bit.