The "G45" is just a road bike,probably 650 or 500 Matchless dressed up to look like a G45, so many things give it away. frame brakes engine, poor fit of the fuel tank. Only a handful left out of the 200 made. The one I had,202, died in the Museum fire. As for the Arrow, I expect its owner loves it.
If you google Matchless G45 images you can check for yourself, and if you cannot spot the differences right away...................................................................mmm?
The Triumphs look to be nice bikes, need a better pic to ID the one that you like the sound of.
Thank you for coming back and for taking my comments in the spirit they were given.[I hope]
I still think you are going about it the wrong way, even more so now you have come up with the idea of building out of donated bits. Any owner of a classic bike will tell you the biggest headache is the widely varying quality of parts, frankly most of it is rubbish, and if its given away it will not be first quality.
Anyone here will tell you the most expensive and long drawn out way of getting a bike is to build it from bits.
Another hurdle is your mindset "these wonderful machines" aren't so "wonderful" Personally I wouldn't have an Indian Enfield as a gift, I had British made ones and they weren't that hot back then.
I love my old bikes,[incidentally Indian enfields are certainly NOT classic, merely an obselete machine made today] but 51 years on older bikes has taught me to be realistic.
Enthusiasm is difficult to turn into 1000s of miles of reliability.
You would be better off with a couple of 250 trail Hondas. probably cheaper too. One thing that will destroy you before the bike is the sheer weight of the things especially when loaded with the gear you'll need, they are a heavy old lump at the start. Lighter is better, just try pushing one with a load of gear on along a dirt road.
Good luck with your idea, I hope it goes safely and well for you. Yes I did read the Street Child bit, my attitude is still charity begins at home, and they need birth control not pencils; missionarys and the like of all kinds have been dishing out pencils and education for a 100yrs or more and made no difference.
There are more than enough children of African descent here in the UK who could do with the same help.
Africa will always be Africa, not even time will change it.
As an after thought I suggest you start searching auto jumbles for projects; It'll give you an idea of expense. A good start would be Netley marsh in September, the Bath and West showground do after, and the Kempton park events, all reasonably easy to get to for you, and you get an idea of how happy those blokes with lots of tat will be to give it away to you.
If nothing else a good place to set up a stall explaining what you want? cast your net wider so to speak?