Or you can buy THE ORIGINAL if you like - nice quick Houseboat 😁
http://www.britishmilitarysurplus.co.uk/documents/exHMCCSentinel-particulars.pdf
😎

There's kit for her here MH,
https://www.modelbouwshopnederland.nl/en_GB/a-26414875/building-kits-model-slipway/sentinel-customs-cutter-ms-12/
More info here, kit comes from Barnsley!
https://www.modelskibet.dk/Resources/Files/PDF/Sentinel%20instructions.pdf
See pdf attachment.

Check out
Model Slipway
77 Arundell Drive, Lundwood
Barnsley S71 5LE
United Kingdom
Answerphone/Fax: 01226 - 715576
E-mail: info@modelslipway.com
www.modelslipway.com
I think Sea Craft also do a kit, available from Harbor Models in the US.
https://www.harbormodels.com/slip115.html
Cheers, Doug 😎