What's that, you don't have $750 laying around for one of those fancy strollers?... well then this build is for you.
I bought this Burley stroller/bike trailer from Craigslist for $160 ($500 retail) in near perfect shape. My wife and I saw that you can buy a ski kit ($230), but that it's not made for the older model we have--- that got the wheels turning.

I spent about $60 for parts from a big box store plus the original $160 for the stroller and it still costs less than the ski set-up alone.

This is my first post here, I hope it's clear. Good luck

Step 1:

Time required:
It took me 4-5 hrs, designing as I built. It should only take you about 2 hrs

Parts list:

1. Baby (optional, small dogs like to go for rides too)
2. Jogging stroller
3. Old pair of skis
4. 4 pcs of 3/4" plywood 1'x2'
5. 4 pcs of 1" square steel tube- 18" ea
6. 8- 3" 1/4-20 Carriage bolts w/ fender washers and wing nuts
7. 4- 3" 1/4-20 bolts w/ flat washers (no bigger than 1") and nuts
8. 1 stick of 3/4" EMT conduit
9. 2 bike tire quick releases
10. 2 rod couplings and threaded rod--same thread as quick release

Tools:

1. Hacksaw
2. Drill w/ 1/4" and 3/8" bits and 1" paddle bit
3. Screwdriver
4. Pliers/ wrench/ sockets... (something to hold the nuts)
5. Wood saw
6. EMT bender

Note:
-All drilled holes are 1/4" except where another size is mentioned.
-The plywood and tubes set-up will be referred to as "the bracket"
-Because this is made to be taken apart for storage and travel you may find it useful to label the parts.
-When installing the carriage bolt set-up, keep the wing nuts on the outside so as not to rip the stroller when assembling.

Step 2:

I cut the skis to about 110cm long just like the ones made by Burley (I saved the backs of the skis for something, I don't know what yet). Then about 3" from the back I fastened a piece of square tube centered on the ski left to right. To do this, I drilled through the tube and out the bottom of the ski. I then flipped the ski over and counter sunk a hole with the paddle bit to accept the bolt and washer--- I'll fill this in later. Through the bottom of the ski I inserted the bolt w/ washer through the tube and tightened.
Next, I centered the plywood on either side of the tubing and drilled holes a couple inches in from each end, attaching with carriage bolts, fenders and wing nuts.

Step 3:

At this point, I found a clip on the side of the stroller was interfering so I made an angle cut down the front of the bracket. I then installed the other piece of tube along this angle with the tops of the plywood and tube lining up, securing with another carriage bolt set-up about mid way. At the top where the bracket would meet the frame of the stroller, I drilled a 1/4" hole through the bracket and drilled a 1"hole on the inside piece of plywood for the 3/4" EMT to sit in- this is where the weight of the stroller will sit.

Step 4:

Next, I measured the distance between outside pieces of plywood when assembled on the stroller less the length of the quick release and cut the threaded rod to fit. I inserted the quick release with a fender washer through the bracket and attached the threaded rod with the rod couplings on either side and inserted that into the stroller's cross tube (I had to bang out 1 pin on each side which held this in place). On the other side, I inserted the quick release with another washer through the bracket and attached to the rod coupling in the cross tube. I think I'll change this to 1/4" threaded rod and wing nuts, sometimes it's hard to line up the quick release and coupling.

Step 5:

After tightening down the quick releases, I bent a piece of EMT with back to back 90s and put in the bracket from the back, just above the 2 pieces of stroller frame sticking out the back. Then drilling through the bracket and pipe I secured with a carriage bolt set-up.