Picturing the Bald Tatooed dwarf in dragonhide slippers
Creation of Magic Items:
The first three assume you have the Create Wondrous Item feat:
Gloves of Storing
Requirement: Shrink Item spell, Base 10,000GP per Glove, = 5000 GP + 400 xp, 10 Days
Bracers of Armor + 2
Requirement:
Mage Armor Spell, Base 4000 gp, = 2000 GP + 160xp, 4 days.
Boots (er, slippers) of Spider Climbing
Spider Climb Spell, Base 4800 gp = 2400 gp +192 xp, 5 days
Because you have some of the raw material, i.e. Dragon Hide, I'll deduct some cost, however, this needs to net with the fact that you need to find a master leatherworker to fashion the items in question, He will be pricy and add extra time. The rules assume (AFAIK) that you have an existing masterwork item. So heres my judgement on what it costs to do these:
Glove of Storing = Shrink Item spell, 3750 gp + 400xp, 12 days
Bracers of Armor = Mage Armor spell, 1600 gp + 160xp, 5 days
Boots of Spider Climb = Spider Climb spell, 2000 gp + 192 xp, 6 days
it reasonable to assume that some of these times could overlap, so the whole shebang in 20 days.
Now for the Shield of Acid Resistance
If you just want to tie the hide over your shield, no problem, it'll cost 50 gp and no xp and give Acid resistance 2.
If you want to merge it with the shield to add acid resistance to you already magical shield, I'll let you do it this way:
7000 gp + Craft Arms and Armor Feat + 720 xp + resist energy spell will yield you a 10% Chance to merge an acid resistance 10 to your shield. I'll let you add +1% for every plus of intelligence. PLUS, for every 1000GP + 100 XP, I'll let you add 10% cumulative to the chance
Timing on this is 15 days + 1 day for every 10% you raise the chance. Fail and the shield and the dragon hide is ruined.
Lets do the same thing with the Amulet and the Periapt. 10% base chance for 5000gp and 500 xp, +1% for every plus of intelligence, +10% for every 1000gp and 100xp you throw at it. If you fail, both items are ruined. This might not be so advantageous, since you don' really know what the amulet does (yet).
All this being said, if you are creating items for other party members, I'll let them contribute the xp.
PS - timing on Bag of Holding, is 2500 gp and 5 days to create. I'll assume that Randall can't wait for it - wait, I know he cant wait. I'll assume he still wants one and will get one through Edmund.