If you are looking for real small LED's for interior lighting I used ChipNano Pico and Z Leds
From www.Evandesigns.com They are in the USA
I used red 3 volt 8" wire (just a little thicker than a hair) you can also get 14" wire length
and 3 volt warm white https://evandesigns.com/products/chip-nano-pico-leds?variant=32158378885168
I used an adjustable voltage regulator to change everything to 3 volts so everything above deck is 3 volts including radar and nav light
https://www.amazon.com/dp/B085WC5G8N/ref=sspa_dk_detail_0?psc=1&pd_rd_i=B085WC5G8N&pd_rd_w=KnZkj&content-id=amzn1.sym.f734d1a2-0bf9-4a26-ad34-2e1b969a5a75&pf_rd_p=f734d1a2-0bf9-4a26-ad34-2e1b969a5a75&pf_rd_r=1WB7Z6E65FCDTMQYS1Q7&pd_rd_wg=qU1JQ&pd_rd_r=ad56aa31-b39c-45c6-ab9c-42fc412038db&s=electronics&sp_csd=d2lkZ2V0TmFtZT1zcF9kZXRhaWw

10MM for the Stern I ordered My Vinyl Letters through Cornwell model boats https://www.cornwallmodelboats.co.uk/cgi-bin/ss000001.pl?page=search&SS=BECC++vinyl&PR=-1&TB=O&ACTION=&ACTION=Go%21 Including flags
Manf by BECC's Self adhesve Vinyl you can order them for your boat as a set Mhttp://www.becc.co.uk/