I don't know if there's a better way of doing this, but this is how I cut and shut my Locost nosecone to fit my +4 chassis.
1. Mark a line down the centre
2. Cut along the line with an angle grinder (use the thinnest cutting disc you can find)
3. Put the 2 halves back together, with a gap in between them to suit your chassis. I achieved this by clamping wooden battons at both ends and in the grille area (mine hadn't been cut out).
4. Fill the gap from the outside with something that the resin won't stick to. I used silicone backed fibreglass tape, but i guess you could wrap it in cling film or use something else.
5. Put it upside down on a workbench and fibreglass 2 layers of CSM across the inside of the gap, ovelapping about 2" on both sides.
6. Once it's hardened, remove whatever you used th blank off the gap and laminate another layer on the outside, but with no overlap.
Once it's all gone hard, you can mount it on the chassis and fill/skim it back smooth before painting it.
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