If using the specified parts, insulation washers and tabs on the heatsink are not required.
For 6.3v use a 9v AC TX operation R5 = 120R, R6+R7 = 560R + 68R (ish) depends upon the reg and Darlington used.
For 12.6v operation, if you have the kit, you need to up-rate the input cap to something like 6800uF @ 25v, watch out for the part's diameter. A 25mm diameter cap is a very tight squeeze and obtaining a 10,000uF at 25v at 22mm is quite a challenge, however 6800uF 25v 22mm is fine. R6 + R7 should be 1.2k + 56R (ish). At a minimum a 12v AC TX should be fine.
As always watch out for cap polarity when stuffing the PCB. The Tantalum cap is marked, but typically on a small Tant with the writing towards you, the positive is on the right.
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Part Farnell Rapid Notes STMICROELECTRONICS - LD1085P TO220F 1 1087151 0 SK 129 50,8 1 1319813 0 TIP122 , NPN, 100V, 5A, TO-220FP 1 1084454 0 2kbp02 2a 200v In-line Bridge s203l 0 1 47-0902 470nf 63v Mks2 Min Poly Capacitor 5mm 0 3 10-2224 Bend Legs to fit or find 10m part 4700uf 16v 7.5mm pitch 16mm dia 0 1 11-3746 10uf 35v 5mm Tantalum 5mm pitch 0 1 11-1022 10000uF 16v 22mm dia 10mm pitch 0 1 11-2990 No longer stocked 1N4001 0 1 47-3130