These ARE the Droids you are looking for!

The hustle and bustle of the droid depot is apparent the second you step in.  Located down the steps from Ronto's Roasters, between Savi's Workshop (Sabers) and the Milk Stand, you can find the Droid Depot.  Like many of the speciality experiences in Star Wars Galaxy's Edge it's better to make a reservation, but they were taking walk-in clients all throughout the day.
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Come, step inside the depot and decide what kind of droid you'd like to build.  Your options are the class "R Unit" or the more modern "BB unit."  We had most of this decided beforehand.  My wife, Angie, had called the BB unit, so to be different I chose to build an R.

Once you've made your way through the line and paid your galactic credits at the register.  You are handed the corresponding tray for your droid.  It does simplify things a bit to see what pieces you need to pick up.  They eliminate a lot of the confusion, but even if you do feel lost their are assistants walking the depot to answer your questions.
You are assigned a spot near the conveyor belt of pieces.  The droid parts do go by at a decent speed, but are easy enough to snag as they pass.  Each droid has their base options of colors.  R units are black, white, red, and blue with the accent colors of purple and orange on some parts.  While the BB units cam in the same colors but had purple as a base color.

While the BB Unit does get a bit more color from the beginning, plus he's really cute.  That's all he has going for him.  BB Units get no accessories.  :(
The R units have plenty of accessories to purchase.  There are sticker packs for customizing colors as well as packs with additional colored panels.  The R unit can also be equipped with blasters or rocket boosters that light up and make sounds.  Additionally there are decorative drink serving attachments and a set of claw hands, though these are all just decorative and cannot actually grab anything or poor you a drink.

Once you've got all your parts you are ushered over to the assembly station.  Hanging over head you have a handy power screwdriver to help with the couple of bolts that need tightening.  Overall assembling goes pretty smoothly as you snap some pieces in and screw down others.  And Voila!  You have a droid assembled and ready to be activated.  The assistants will pop your droid into the activation chamber, you press the big red button and HE'S ALIVE!!!

Though Angie had chosen the BB unit, she was very displeased with him.  The BB units head would fall off really easily while he was rolling around our hotel room.
She was so displeased that the next day we went back and after a small amount of complaints were able to exchange our faulty BB unit for another R unit.

Each droid comes with their own preset sounds.  R units sound like R2D2 and BB units sound like BB8.  You can however purchase personality chips that will change the sounds and demanor of your robot in the park.  Yes the droid react as you take them around the park.  You can even purchase a special backpack to carry them around, or carry around the box that comes with the purchase.  

If you buy the personality chips your droid will react and make different sounds in certain areas.  The personalities come in Resistance, Smuggler, and First Order.  Droids will perk up in their appropriate area and make sad nervous sounds in opposing areas.  It's really cute, but the we didn't want the added hassle of carrying our droids the whole day. 
Each droid comes with his own controller that manages his movements and sounds.  If you've ever handled a remote controlled anything the R units are pretty easy to handle while the BB units take a fair amount of practice to figure out how this ball is going to move around. 

Here are our droids with custom panels and stickers.  Angie's R8R8, because he alright alright alright.  And my droid RUOK, the medic droid.  Each droid will cost you 100 credits, while accessories will range from 12 to 25.  Sticker packs, panels, and personality chips were all about 12 credits.

Through the other door of the depot there was a neat shop full of droid themed accessories and of course the most expensive toy you can purchase.  A FULL SIZED R2D2 unit!  just $25,000 credits for that one.  Sure you can customize him, but I could also get a pretty good car at that price point.  It was fun to interact with the classic R2!  We had a blast building our droids and our kids have loved playing with them around the house!