Hi Landro
The PRO at Kew has a lot of maps of the Italian campaign in the class WO 369
Some pieces which might interest you (but might be a bit small scale?):
WO 369/11 Covers 1:25 000 (Italian) series Topographical maps listed on p 3 of WO 1925 Index [piece 3] from Cordignano [piece 209] to Val d'Assa [piece 229] Also marked in green are the Italian maps showing Enemy Defences in the Isonzo Front covered by Graphic Index [piece 13] Without date
WO 369/229 Val d'Assa Sheet Number Parts of Sheets 36 & 37 Ed No 3 Production: compiled/produced: Redrawn map in grey with integral Lambert grid by 6th FSC (549) Date corrected or O/P 23.06.18
WO 369/359 Val d'Assa: [Hostile Battery Positions established up to] 22 May 1918 [Artillery Map] Parts of Sheets 36 & 37 Ed No 2 TL-E Production: compiled/produced 6th FSC (481) Date corrected or O/P 22.05.18 15.05.18
WO 369/360 Val d'Assa: [Hostile Battery Positions established up to] 10 Jun 1918 [Artillery Map] Parts of Sheets 36 & 37 Ed No 2 TL-E Production: compiled/produced 6th FSC (527) Date corrected or O/P 10.06.18 15.05.18
WO 369/361 Val d'Assa: [Hostile Battery Positions established up to] 25 Jun 1918 [Artillery Map] Parts of Sheets 36 & 37 Ed No 2 TL-E Production: compiled/produced 6th FSC (553) Date corrected or O/P 25.06.18 15.05.18
WO 369/362 Val d'Assa: [Hostile Battery Positions established up to] 9 Jul 1918 [Artillery Map] Parts of Sheets 36 & 37 Ed No 3 TL-E Production: compiled/produced 6th FSC (573) Date corrected or O/P 08.07.18 23.06.18
WO 369/363 Val d'Assa: [Hostile Battery Positions up to] 24 Jul 1918 [Artillery Map] Parts of Sheets 36 & 37 Ed No 3 TL-E Production: compiled/produced 6th FSC (606) Date corrected or O/P 25.07.18 23.06.18
WO 369/364 Val d'Assa: [Hostile Battery Positions established up to] 12 Aug 1918 [Artillery Map] Parts of Sheets 36 & 37 Ed No 3 TL-E Production: compiled/produced 6th FSC (679) Date corrected or O/P 12.08.18 23.06.18
WO 369/365 Val d'Assa: [Hostile Battery Positions established up to] 30 Aug 1918 [Artillery Map] Parts of Sheets 36 & 37 Ed No 3 TL-E Production: compiled/produced 6th FSC (679) Date corrected or O/P 01.09.18 23.06.18
WO 369/366 Val d'Assa: [Hostile Battery Positions established up to] 30 Sep 1918 [Artillery Map] Parts of Sheets 36 & 37 Ed No 3 TL-E Production: compiled/produced 6th FSC (726) Date corrected or O/P 27.09.18 23.06.18
WO 369/388 Val d'Assa: Target Map compiled from air-photos and confirmed reports to 2 May 1918 Sheet Number Fo 36 I-SE & Fo 37 IV-SO Ed No 1 TL-E Production: compiled/produced Compiled by Intelligence, GHQ, Italy, and printed by Army Printing and Stationery Services (353) on Carta d'Italia base map by Istituto Geografico Militare reprinted by 6th Field Survey Coy RE (449) Date corrected or O/P 08. 02.04.18
WO 369/389 Extension Slip to Val d'Assa Target Map Edition 1 Sheet Number Fo 36 I-NE & Fo 37 IV-NO Ed No 1 TL-E Production: compiled/produced As piece 388. Produced by FSC (450) and printed by APSS (355) Date corrected or O/P 08.05.18 08.05.18
WO 369/390 Val d'Assa: Target Map compiled from aeroplane photographs and reports to 29 May 1918 Sheet Number Fo 36 I-SE & Fo 37 IV-SO Ed No 2 TL-E Production: compiled/produced As piece 388. Produced by FSC (508) and printed by APSS (458) Date corrected or O/P 03.06. 02.04.18
WO 369/391 Extension Slip to Val d'Assa Target Map Edition 2 Sheet Number Fo 36 I-NE Fo 37 IV-NO Ed No 2 TL-E Production: compiled/produced As piece 390. Produced by FSC (507) and printed by APSS (498) Date corrected or O/P 01.06.18 08.05.18
WO 369/392 Val d'Assa; Enemy's Concentration Areas and Routes used previous to Attack of 15 Jun 1918 determined from captured documents, prisoners' statements and photographs Parts of Sheets 36 & 37 Ed No 2 TL-E Production: compiled/produced Compiled by Intelligence, GHQ, Italy, and printed on redrawn base map in grey by 6th FSC (545) Date corrected or O/P 21. 15.05.18
WO 369/394 Val d'Assa: Target Map compiled from aeroplane photographs and reports to 11 Jul 1918 Sheet Number Fo 36 I-SE & Fo 37 IV-SO Ed No 3 TL - E Production: compiled/produced: As piece 388. Produced by FSC (580) and printed by APSS (355) Date corrected orO/P 13. 02.04.18
WO 369/395 Extension Slip to Val d'Assa Target Map Edition 3 Sheet Number Fo 36 I-NE & Fo 37 IV-NO Ed No 3 TL - E Production: compiled/produced: As piece 394. Produced by FSC (581) and printed by APSS (355) Date corrected or O/P 13.07.18 08.05.18
Mostly maps and replots of battery positions.
You can search the PRO archives here:
National archives searchOtherwise as other has mentioned Imperial war museum, may be RAF Museum at Hendon for aerial photos.
Hope this helps
Cheers
Dominic