Welcome to iboats
Lets see some pix of your Admiral
Windshield and brackets that will work, or can be made to work, can be found on craigs, ebay or other classified ad sites. Might get lucky and find LoneStar ones, but be prepared to look everyday and it still may take a long time.
Same for the LS script logos. If you have at least one, some have cast their own after taking a mold of the existing one. If the 1 you have is cracked, it could probably be repaired enough to pull a mold and cast 2.
GarzonStudios is 1 of many online places you can decals. ReplacementVinyl is another. I got a capacity 'plate' for a SeaNymph from Garzon. It isnt an actual plate, but it is a high quality vinyl label that I could adhere to an aluminum plate then mount it to the boat. Or simply adhere it to the transom directly. Any good local vinyl wrap company could probably replicate anything you can provide a good high res pix of. But then you have to pay their graphics person to create the cut template, and that can get expensive by the hour.
I know a guy on another forum that has done lots of vinyl work for members of that forum, some of which was for a Lone Star. Private message me if you'd like his contact info.
A trophy/engraving place may be able to make you a capacity plate on an actual aluminum plate by using a sublimation process. But again, be prepared for their graphics person to charge by the hour to create it before they can 'print' it. On that other forum, we did that, but w the graphics charge split 10ways, it wasnt cost prohibitive. They were not cheap per plate, though after you factor the graphics charge.
What other parts are you looking for? May have to make a few trips to boat salvage yards to find LS specific stuff. Where are you located?
Welcome again, look forward to the pix. Just a heads up, dont use pressure treated wood anywhere in a tin boat. If it has PT lumber in it now, remove it. Sooner then later.