3.5in Titch - Help Needed

Hello All,

So I was kindly donated a part built Titch earlier this week, from a member of our local club. The gent who donated it says he is not likely to do any more work on it, and he started it almost 20 years ago.
I am 30, so he said I have a little more time than him to get it running.He has completed and assembled the frames, and fitted the wheels, axles, ram pump and mechanical lubricator.
He has also completed the cylinders, steam chests and slide valves, pistons, but these are not yet fitted to the frames.
From my very novice assessment, and knowledge of his other models he has built, there seems to be very good fitting and no sloppiness in the hornblocks/axles/pistons/etc.

There are no materials with what he gave me, and unfortunately only part of the plans. However, he did include

He also gave me the book Simple Model Locomotive Building: Tich by "L. B. S. C."

Re the plans, there are only 4 sheets of the 12-sheet set, and 2 of them are so faded they are unreadable.

Re my skills, I have build an ok-running Stuart10V, and have a Stuart S50 kit waiting to be built. I've also made several other things, including a boiler, but this Titch engine is definitely going to be my most complicated build.

OK, so now I have set the scene, I have some questions to all you fine people:

1) How long would the Titch take to make? I know this is very open-ended. I work, (event through Covid luckily) so will probably only manage ~10-15h/week of building time.
My Stuart 10V took me around 200h to build, but that was at a very slow pace. I recon I could probably build she S50 in around 100h.

2) Does anybody have any plans they would be willing to share? Digital or physical.

3) There seems to be several variations on the model also. Walscharts valve gear vs internal excentric, Normal vs Large boiler, plus several other variations. He has already started the Waalscharts valve gear, so I will be sticking with that. What other variations should I be considering?

Many thanks for your time.

Kindest regards,