I'd hate to have to front the cost for upgrading all of those when the time comes.
Getting them all relatively current would probably bankrupt the whole party, not just the skittermander. Will probably have to rely almost solely on all the guns the enemies drop.
And if you use the Flight frame for power armour, you get 3 weapon mounts. And everyone knows that a skittermander with an odd number of weapon mounts is obligated by law to make one of them attached to the stomach/chest area, a la Care Bears (of course it would be a ridiculously powerful artillery laser or some such, but the skittermander believeing it's a friendship ray is what's important).
Edit:
The Ultimate Skittermander:
Price . . . Item
027 100 - Flight Frame (L11, 40B)
735 000 - Shock Caster, Tempest (L20, 2B) [Weapon Mount]
826 000 - X-Gen Gun, Paragon (L20, 2B) [Weapon Mount]
412 800 - Zero Cannon, Elite (L18, 2B) [Weapon Mount]
565 000 - Plasma Pistol, Blue Star (L19, LB) [1 hand]
715 800 - Gyrojet Pistol, Elite (L20, LB) [1 hand]
364 500 - Sonic Rifle, Banshee (L18, 2B) [2 hands]
550 000 - Acid Lancer, Disintegrator-Class (L19, 2B) [2 hands]
TOTAL COST: 4, 196, 200 credits
027 100 - Flight Frame (L11, 40B)
735 000 - Shock Caster, Tempest (L20, 2B) [Weapon Mount]
826 000 - X-Gen Gun, Paragon (L20, 2B) [Weapon Mount]
412 800 - Zero Cannon, Elite (L18, 2B) [Weapon Mount]
565 000 - Plasma Pistol, Blue Star (L19, LB) [1 hand]
715 800 - Gyrojet Pistol, Elite (L20, LB) [1 hand]
364 500 - Sonic Rifle, Banshee (L18, 2B) [2 hands]
550 000 - Acid Lancer, Disintegrator-Class (L19, 2B) [2 hands]
TOTAL COST: 4, 196, 200 credits
This covers all damage types (except slashing), fits within the skittermander + flight frame powered armour limit. It doesn't require any cybernetic arms, but if you add them, then you can get a dimesnional slice longsword for slashing damage as well. Alternatively, you can maze-core some of the guns together with swords to save on slots.