This will help you with what panels you will need
M MACHINE PANELS
HEELBOARD BRACKET L/H:- 11.32.02.27 £4.80
HEELBOARD BRACKET R/H:- 11.32.02.28 £4.80
OUTER SILL L/H:- 14.32.00.01 £21.60
OUTER SILL R/H:- 14.32.00.02 £21.60
FLITCH PANEL R/H:- 13.21.00.18 £12.00
FLITCH PANEL L/H:- 13.21.00.17 £12.00
DOOR REPAIR PANEL R/H:- 13.15.00.28 £16.80
DOOR REPAIR PANEL L/H:- 13.15.00.27 £16.80
DOOR STEP L/H:- 13.14.10.17 £10.80
11.31.04.37 Floor Inner Sill to First Groove, LH, Mk1-5 £35.40
11.31.04.38 Floor Inner Sill to First Groove, RH, Mk1-5 £35.40
13.14.10.18 Detailed Door Step, RH, Mk3 on £10.80
11.32.06.01 Jacking Point, LH, Mk1-4 £7.80
11.32.06.02 Jacking Point, RH, Mk1-4 £7.80
13.14.01.17 Quarter Panel Liner Retainer, LH, Mk3 on £16.80
Heritage Panels
R/h WING:- 14A7240 £88.00
L/H WING:- 14A7241 £88.00
FRONT PANEL:- ALA8619 £150.00
SCUTTLE:- HMP441001 £115.00
SCUTTLE CLOSE OUT R/H:- 14A8348 £12
SCUTTLE CLOSE OUT L/H:- 14A8349 £12
A PANEL L/H:- ALA5661 £19.99
A PANEL R/H:- ALA5660 £19.99
REAR QUARTER PANEL R/H:- HMP441014 £95.00
REAR QUARTER PANEL L/H:- HMP441015 £95.00
DOOR SKIN R/H:- CZH3300 £70.00
DOOR SKIN L/H:- CZH3301 £70.00
REAR VALANCE:- CZH3353 £45.00
REAR VALANCE CLOSEOUT R/H:- HMP441020 £31.64
REAR VALANCE CLOSEOUT L/H:- HMP441021 £31.64
This is the list of panels i am doing on Wills Mini Special and is pretty much what you need. You don't have to have Heritage panels but the scuttle you will need if yours is bad. Pattern wings, front panel and A panels will work as will the door skins and rear quarter panels.
The boot floor assembly will be Heritage if you decide to buy that. I would buy all of the Heritage stuff from Minispeed so get yourself TMF+ membership and get 12.5% discount on Heritage only panels.