Hi Borsos
Two good general museums in Glasgow - KelvinGrove and Transport Museum
Kelvingrove has a Spitfire XXI hanging from the roof - at least it did recently, but it might be down for cleaning at the moment, I'd have to check. Lots of major oil paintings including a very famous Dali
Transport museum used to have a lot of huge ship models but since relocating to new premises on the Clyde I think many are now in storage. There is at least one magnificent 1/48 HMS Hood on dispaly though. Lots of vehicles, trains etc. and a Tall Ship in the water outside. I'm sure you'll find lots of interest here.
Best model shop for me is Scott's Models, but not much WWI I'm afraid. Ian, the owner, is a real character and runs what he calls a "creche" for baby-boomer modellers outfront of his shop while their wives are shopping in the nearby St Enoch Centre. Just off Saltmarket, near the High Court. Worth a visit for the authentic Glasgow "banter".
When you get into the Highlands you will find WWI war Memorials at every little town and village - makes you ponder. At the moment Scotland (and rest of UK) is involved in a massive commemoration of the battle of Paaschendaele. Last Sunday for example we had the massed pipes and drums of the Black Watch and other regiments march through Crieff for a couple of miles and co0nclude with a drum-head service in the Market Park. Lots of modern Army Ordnance on display. Worth checking where you intend to be.
You probably have your route all planned, but I advise that you head as far north and west as you can. Anywhere above Skye is fabulous!! Coastal is good too as August inland is plagued by the dreaded Scottish midge - thousands of tiny biting insects. TAKE LOTS OF INSECT REPELLANT.
Skye is ridiculously busy in August, but of course iconic. I'd advise anybody new to Scotland to visit Morar, Torridon, Plockton, Applecross, Ullapool, LochInver, Handa Island on up to Cape Wrath and the magnificent Sandwood Bay. This requires a longish walk in but is one of God's own places, never to be forgotten. I'd avoid Loch Ness, Fort William and John O Groats - tourist buses and not much to see.
If I can help in any way, drop me a PM.
Cheers
Sandy
PS Best Air Museums are East Coast - East Fortune outside Edinburgh and Montrose where they are building a BE2 replica (housed in old WWI RFC 2Sqdn buildings.)