Keep in mind that apart from the very specific .22 parts, everything in a No. 7 rifle is typical '44, '45, '46 standard production No. 4. Walnut furniture, fabricated trigger guard, etc.
Nice LB No. 4 parts sets aren't particularly easy to source, whether for a .303, 7.62 or .22 project.
So, the .22 parts are: barrel; front sight base w/pin; bolt head, firing pin and extractor; striker rod; complete rear sight assembly.
I used a Savage low wall forend for my project. Didn't have a nice LB walnut high wall on hand. Should one appear, I'll swap forends.
Another option is to make a clone of the British No. 9 rifle. Use a .303 receiver, Brit parts are appropriate throughout.
As illustrated in my thread, lining a .303 barrel isn't rocket science.
