Good writeup. A few things from doing this on Komatsu H1F and H2F presses:
Before you pull the old liners, measure and record the actual clearance at 8 points around each gib (top, bottom, and 3 points along the length on each side). This gives you a wear pattern map. If wear is concentrated at the bottom, it usually means the counterbalance is set too low and the slide is dropping onto the gibs at BDC. Fix the counterbalance before installing new liners or you will wear them out again in half the time.
On scraping: we blue-fit every new liner in place. Takes an extra 2-3 hours per liner but the contact pattern should be 70%+ before you call it done. Anything less and you get point loading that accelerates wear. I use a straight edge with Dykem blue, not Prussian blue -- Dykem shows up better on bronze.
Temperature matters too. Do the final clearance check after running the press at production speed for 20 minutes. Thermal growth changes gib clearance by 0.01-0.02mm on a 300T press. If you set clearance cold, it will be too tight when warm and you will score the new liners on the first production run.