Nice one !
I know what you mean about the instructions - the kit is from the period when the company was still known as 'Italaerei' (now called 'Italeri'), and there instruction sheets at that time were often quite vague, especially concerning the exact location and angle of smaller details parts. But that said, they were quite ahead of the field. at that time, in producing some finely detailed pars, and nice kits, at (then) very reasonable prices.
That's going to be an impressive model when done, especially if it's part of a diorama - but imagine what it would be like in 1/48th scale!
If it's got a 30 inch span in 1/72nd scale, then it would be almost four feet (about 45 inches) in 1/48th scale !!!