Have you tried the people who supply the half-kit [hull and plans]. Sirmar Models
The hull you describe I think I know as the Isle Class minesweeper with plans by R J Barnes. Sorry I don’t want to let the plans go* and anyway you describe it as a trawler which is a different configuration although likely built on the same hull during WWII 1944.
Possibly available from Jecobin,31 Roman’s Way, Pyrford, Woking surrey GU22 8TR
I could well have my wires crossed with that address.
*One day I might build her properly instead my cocked-up scratch, which goes very well, beautiful hull but horrible superstructure by yours truely as various freinds have put it
I took one or two looks at the plans and chickened out at the detail required. But maybe when I learn more about modelling